Introduction

The following are the events for the OpenJDK 18 (jdk-18.0.3+0, 26-March-2023). The events are collected from the event configuration and the source code. Visit jfreventcollector for more information. this is also the place you can contribute additional event descriptions, if you don't want to contribute them directly to the OpenJDK. The site generator lives on GitHub too.

This page is maintained by Johannes Bechberger of the SapMachine team at SAP and contributors.

Flight Recorder

DumpReason

default profiling startTime 11 17 20 21

Category: Flight Recorder

Who requested the recording and why

Configuration	enabled
default	true
profiling	true

Field	Type	Description
reason	string	Reason Reason for writing recording data to disk
recordingId	int	Recording Id Id of the recording that triggered the dump, or -1 if it was not related to a recording

DataLoss

default profiling startTime 11 17 20 21

Category: Flight Recorder

Data could not be copied out from a buffer, typically because of contention

Configuration	enabled
default	true
profiling	true

Field	Type	Description
amount	ulong: bytes	Amount Amount lost data
total	ulong: bytes	Total Total lost amount for thread

Examples 3

amount	ulong: bytes	16356
startTime	long: millis	498058602834
total	ulong: bytes	327197

amount	ulong: bytes	16356
startTime	long: millis	536626408042
total	ulong: bytes	588938

amount	ulong: bytes	16356
startTime	long: millis	440107342417
total	ulong: bytes	1750486

Flush

experimental startTime duration 14 17 20 21

Category: Flight Recorder

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	threshold
default	false	0 ns
profiling	false	0 ns

Field	Type	Description
flushId	ulong	Flush Identifier
elements	ulong	Elements Written
size	ulong: bytes	Size Written

Examples 3

elements	ulong	3162
flushId	ulong	319
size	ulong: bytes	581873
startTime	long: millis	566969911709

elements	ulong	523
flushId	ulong	204
size	ulong: bytes	257362
startTime	long: millis	580742176542

elements	ulong	4567
flushId	ulong	182
size	ulong: bytes	1017136
startTime	long: millis	431888167000

ActiveRecording

default profiling startTime duration stackTrace 11 17 20 21

Source src/jdk.jfr/share/classes/jdk/jfr/events/ActiveRecordingEvent.java

Category: Flight Recorder

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled
default	true
profiling	true

Field	Type	Description
id	long	Id
name	string	Name Consider contributing a description to jfreventcollector.
destination	string	Destination Consider contributing a description to jfreventcollector.
maxAge	long: millis	Max Age
flushInterval	long: millis 14+	Flush Interval
maxSize	long: bytes	Max Size
recordingStart	long: epochmillis	Start Time
recordingDuration	long: millis	Recording Duration

Examples 3

destination	string	[...]/code/experiments/jfreventcollector/jfr/sample_UseParallelGC.jfr
flushInterval	long: millis	1000
id	long	1
maxAge	long: millis	9223372036854775807
maxSize	long: bytes	262144000
name	string	1
recordingDuration	long: millis	9223372036854775807
recordingStart	long: epochmillis	1673458001344
stackTrace	StackTrace	null
startTime	long: millis	376195834

destination	string	[...]/code/experiments/jfreventcollector/jfr/sample_UseG1GC.jfr
flushInterval	long: millis	1000
id	long	1
maxAge	long: millis	9223372036854775807
maxSize	long: bytes	262144000
name	string	1
recordingDuration	long: millis	9223372036854775807
recordingStart	long: epochmillis	1673457379057
stackTrace	StackTrace	null
startTime	long: millis	333187834

destination	string	[...]/code/experiments/jfreventcollector/jfr/sample_UseSerialGC.jfr
flushInterval	long: millis	1000
id	long	1
maxAge	long: millis	9223372036854775807
maxSize	long: bytes	262144000
name	string	1
recordingDuration	long: millis	9223372036854775807
recordingStart	long: epochmillis	1673458608832
stackTrace	StackTrace	null
startTime	long: millis	357238083

ActiveSetting

default profiling startTime duration stackTrace 11 17 20 21

Source src/jdk.jfr/share/classes/jdk/jfr/events/ActiveSettingEvent.java

Category: Flight Recorder

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled
default	true
profiling	true

Field	Type	Description
id	long	Event Id
name	string	Setting Name
value	string	Setting Value

Examples 3

id	long	1487
name	string	threshold
stackTrace	StackTrace	null
startTime	long: millis	483203615292
value	string	20 ms

id	long	66
name	string	enabled
stackTrace	StackTrace	null
startTime	long: millis	381379409250
value	string	true

id	long	96
name	string	enabled
stackTrace	StackTrace	null
startTime	long: millis	476715963750
value	string	true

JVM

JVMInformation

default profiling startTime duration end chunk 11 17 20 21

Category: Java Virtual Machine

Description of JVM and the Java application

Configuration	enabled	period
default	true	beginChunk
profiling	true	beginChunk

Field	Type	Description
jvmName	string	JVM Name
jvmVersion	string	JVM Version
jvmArguments	string	JVM Command Line Arguments
jvmFlags	string	JVM Settings File Arguments
javaArguments	string	Java Application Arguments
jvmStartTime	long: epochmillis	JVM Start Time
pid	long	Process Identifier

Examples 3

javaArguments	string	[...]/code/experiments/jfreventcollector/.cache/renaissance.jar -t 5 -r 1 all
jvmArguments	string	-XX:StartFlightRecording=filename=[...]/code/experiments/jfreventcollector/jfr/sample_UseSerialGC.jfr,settings=[...]/code/experiments/jfreventcollector/.cache/jfc.jfc -XX:+UseSerialGC
jvmFlags	string	null
jvmName	string	OpenJDK 64-Bit Server VM
jvmStartTime	long: epochmillis	1673458608531
jvmVersion	string	OpenJDK 64-Bit Server VM (19+36-sapmachine) for bsd-aarch64 JRE (19+36-sapmachine), built on Sep 19 2022 15:20:37 by "apurple" with clang Apple LLVM 13.0.0 (clang-1300.0.29.3)
pid	long	60548
startTime	long: millis	448138185792

javaArguments	string	[...]/code/experiments/jfreventcollector/.cache/renaissance.jar -t 5 -r 1 all
jvmArguments	string	-XX:StartFlightRecording=filename=[...]/code/experiments/jfreventcollector/jfr/sample_UseParallelGC.jfr,settings=[...]/code/experiments/jfreventcollector/.cache/jfc.jfc -XX:+UseParallelGC
jvmFlags	string	null
jvmName	string	OpenJDK 64-Bit Server VM
jvmStartTime	long: epochmillis	1673458001022
jvmVersion	string	OpenJDK 64-Bit Server VM (19+36-sapmachine) for bsd-aarch64 JRE (19+36-sapmachine), built on Sep 19 2022 15:20:37 by "apurple" with clang Apple LLVM 13.0.0 (clang-1300.0.29.3)
pid	long	59959
startTime	long: millis	552272637250

javaArguments	string	[...]/code/experiments/jfreventcollector/.cache/renaissance.jar -t 5 -r 1 all
jvmArguments	string	-XX:StartFlightRecording=filename=[...]/code/experiments/jfreventcollector/jfr/sample_UseG1GC.jfr,settings=[...]/code/experiments/jfreventcollector/.cache/jfc.jfc -XX:+UseG1GC
jvmFlags	string	null
jvmName	string	OpenJDK 64-Bit Server VM
jvmStartTime	long: epochmillis	1673457378757
jvmVersion	string	OpenJDK 64-Bit Server VM (19+36-sapmachine) for bsd-aarch64 JRE (19+36-sapmachine), built on Sep 19 2022 15:20:37 by "apurple" with clang Apple LLVM 13.0.0 (clang-1300.0.29.3)
pid	long	59413
startTime	long: millis	507409823042

InitialSystemProperty

default profiling startTime duration end chunk 11 17 20 21

Category: Java Virtual Machine

System Property at JVM start

Configuration	enabled	period
default	true	beginChunk
profiling	true	beginChunk

Field	Type	Description
key	string	Key
value	string	Value

Examples 3

key	string	sun.java.launcher
startTime	long: millis	481979142125
value	string	SUN_STANDARD

key	string	sun.java.launcher
startTime	long: millis	415983849083
value	string	SUN_STANDARD

key	string	java.vm.info
startTime	long: millis	532692603125
value	string	mixed mode

JVM: Class Loading

ClassLoad

startTime duration eventThread stackTrace 11 17 20 21

Category: Java Virtual Machine / Class Loading

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	stackTrace	threshold
default	false	true	0 ms
profiling	false	true	0 ms

Field	Type	Description
loadedClass	Class	Loaded Class Consider contributing a description to jfreventcollector.
definingClassLoader	ClassLoader	Defining Class Loader Consider contributing a description to jfreventcollector.
initiatingClassLoader	ClassLoader	Initiating Class Loader Consider contributing a description to jfreventcollector.

Examples 3

definingClassLoader	ClassLoader	null
initiatingClassLoader	ClassLoader	null
loadedClass	Class
classLoader	ClassLoader	null
hidden	boolean	true
modifiers	int	48
name	string	java.lang.invoke.LambdaForm$MH+0x0000000800240000/2041628679
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/lang/invoke
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	0
lineNumber	int	-1
method	Method
descriptor	string	(Ljava/lang/ClassLoader;Ljava/lang/Class;Ljava/lang/String;[BIILjava/security/ProtectionDomain;ZILjava/lang/Object;)Ljava/lang/Class;
hidden	boolean	false
modifiers	int	264
name	string	defineClass0
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	1057
name	string	java/lang/ClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/lang
type	FrameType	Native
		…
truncated	boolean	true
startTime	long: millis	484148180959

definingClassLoader	ClassLoader	null
initiatingClassLoader	ClassLoader	null
loadedClass	Class
classLoader	ClassLoader	null
hidden	boolean	true
modifiers	int	48
name	string	java.lang.invoke.LambdaForm$DMH+0x00000008041fa400/308656917
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/lang/invoke
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	0
lineNumber	int	-1
method	Method
descriptor	string	(Ljava/lang/ClassLoader;Ljava/lang/Class;Ljava/lang/String;[BIILjava/security/ProtectionDomain;ZILjava/lang/Object;)Ljava/lang/Class;
hidden	boolean	false
modifiers	int	264
name	string	defineClass0
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	1057
name	string	java/lang/ClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/lang
type	FrameType	Native
		…
truncated	boolean	true
startTime	long: millis	502798706292

definingClassLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/net
initiatingClassLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/net
loadedClass	Class
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/net
hidden	boolean	true
modifiers	int	4144
name	string	org.apache.spark.ml.recommendation.ALS$$$Lambda$18875+0x0000000804241b10/254211268
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/net
location	string	null
name	string	null
version	string	null
name	string	org/apache/spark/ml/recommendation
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	0
lineNumber	int	-1
method	Method
descriptor	string	(Ljava/lang/ClassLoader;Ljava/lang/Class;Ljava/lang/String;[BIILjava/security/ProtectionDomain;ZILjava/lang/Object;)Ljava/lang/Class;
hidden	boolean	false
modifiers	int	264
name	string	defineClass0
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	1057
name	string	java/lang/ClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/lang
type	FrameType	Native
		…
truncated	boolean	false
startTime	long: millis	448126402250

ClassDefine

startTime eventThread stackTrace 11 17 20 21

Category: Java Virtual Machine / Class Loading

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	stackTrace
default	false	true
profiling	false	true

Field	Type	Description
definedClass	Class	Defined Class Consider contributing a description to jfreventcollector.
definingClassLoader	ClassLoader	Defining Class Loader Consider contributing a description to jfreventcollector.

Examples 3

definedClass	Class
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/net
hidden	boolean	false
modifiers	int	49
name	string	scala/reflect/internal/Types$Type$$anon$1
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/net
location	string	null
name	string	null
version	string	null
name	string	scala/reflect/internal
definingClassLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/net
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	0
lineNumber	int	-1
method	Method
descriptor	string	(Ljava/lang/ClassLoader;Ljava/lang/String;[BIILjava/security/ProtectionDomain;Ljava/lang/String;)Ljava/lang/Class;
hidden	boolean	false
modifiers	int	264
name	string	defineClass1
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	1057
name	string	java/lang/ClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/lang
type	FrameType	Native
		…
truncated	boolean	false
startTime	long: millis	450114010917

definedClass	Class
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/net
hidden	boolean	false
modifiers	int	49
name	string	org/apache/spark/sql/catalyst/expressions/objects/UnresolvedMapObjects$
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/net
location	string	null
name	string	null
version	string	null
name	string	org/apache/spark/sql/catalyst/expressions/objects
definingClassLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/net
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	0
lineNumber	int	-1
method	Method
descriptor	string	(Ljava/lang/ClassLoader;Ljava/lang/String;[BIILjava/security/ProtectionDomain;Ljava/lang/String;)Ljava/lang/Class;
hidden	boolean	false
modifiers	int	264
name	string	defineClass1
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	1057
name	string	java/lang/ClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/lang
type	FrameType	Native
		…
truncated	boolean	true
startTime	long: millis	537894735667

definedClass	Class
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/net
hidden	boolean	false
modifiers	int	33
name	string	org/apache/spark/storage/BlockManagerDecommissioner
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/net
location	string	null
name	string	null
version	string	null
name	string	org/apache/spark/storage
definingClassLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/net
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	0
lineNumber	int	-1
method	Method
descriptor	string	(Ljava/lang/ClassLoader;Ljava/lang/String;[BIILjava/security/ProtectionDomain;Ljava/lang/String;)Ljava/lang/Class;
hidden	boolean	false
modifiers	int	264
name	string	defineClass1
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	1057
name	string	java/lang/ClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/lang
type	FrameType	Native
		…
truncated	boolean	false
startTime	long: millis	553879094084

ClassRedefinition

default profiling startTime 15 17 20 21

Category: Java Virtual Machine / Class Loading

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled
default	true
profiling	true

Field	Type	Description
redefinedClass	Class	Redefined Class Consider contributing a description to jfreventcollector.
classModificationCount	int	Class Modification Count The number of times the class has changed
redefinitionId	ulong	Class Redefinition Id

RedefineClasses

default profiling startTime duration eventThread stackTrace 15 17 20 21

Category: Java Virtual Machine / Class Loading

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	stackTrace	threshold
default	true	true	0 ms
profiling	true	true	0 ms

Field	Type	Description
classCount	int	Class Count
redefinitionId	ulong	Class Redefinition Id

RetransformClasses

default profiling startTime duration eventThread stackTrace 15 17 20 21

Category: Java Virtual Machine / Class Loading

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	stackTrace	threshold
default	true	true	0 ms
profiling	true	true	0 ms

Field	Type	Description
classCount	int	Class Count
redefinitionId	ulong	Class Redefinition Id

ClassUnload

startTime eventThread 11 17 20 21

Category: Java Virtual Machine / Class Loading

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled
default	false
profiling	false

Field	Type	Description
unloadedClass	Class	Unloaded Class Consider contributing a description to jfreventcollector.
definingClassLoader	ClassLoader	Defining Class Loader Consider contributing a description to jfreventcollector.

Examples 3

definingClassLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/net
startTime	long: millis	543927277542
unloadedClass	Class
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/net
hidden	boolean	false
modifiers	int	49
name	string	scala/collection/immutable/Vector3
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/net
location	string	null
name	string	null
version	string	null
name	string	scala/collection/immutable

definingClassLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/net
startTime	long: millis	559700696459
unloadedClass	Class
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/net
hidden	boolean	false
modifiers	int	49
name	string	scala/runtime/BoxedUnit
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/net
location	string	null
name	string	null
version	string	null
name	string	scala/runtime

definingClassLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/net
startTime	long: millis	458806015708
unloadedClass	Class
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/net
hidden	boolean	false
modifiers	int	1537
name	string	scala/concurrent/stm/ccstm/AccessHistory$WriteBuffer
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/net
location	string	null
name	string	null
version	string	null
name	string	scala/concurrent/stm/ccstm

JVM: Code Cache

CodeCacheFull

default profiling startTime eventThread 11 17 20 21

Category: Java Virtual Machine / Code Cache

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled
default	true
profiling	true

Field	Type	Description
codeBlobType	CodeBlobType	Code Heap Consider contributing a description to jfreventcollector.
startAddress	ulong: address	Start Address
commitedTopAddress	ulong: address	Commited Top
reservedTopAddress	ulong: address	Reserved Top
entryCount	int	Entries
methodCount	int	Methods
adaptorCount	int	Adaptors
unallocatedCapacity	ulong: bytes	Unallocated
fullCount	int	Full Count

CodeCacheStatistics

default profiling startTime every chunk 11 17 20 21

Category: Java Virtual Machine / Code Cache

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	period
default	true	everyChunk
profiling	true	everyChunk

Field	Type	Description
codeBlobType	CodeBlobType	Code Heap Consider contributing a description to jfreventcollector.
startAddress	ulong: address	Start Address
reservedTopAddress	ulong: address	Reserved Top
entryCount	int	Entries
methodCount	int	Methods
adaptorCount	int	Adaptors
unallocatedCapacity	ulong: bytes	Unallocated
fullCount	int	Full Count

Examples 3

adaptorCount	int	1858
codeBlobType	CodeBlobType	CodeHeap 'non-nmethods'
entryCount	int	1945
fullCount	int	0
methodCount	int	0
reservedTopAddress	ulong: address	5238521856
startAddress	ulong: address	5232672768
startTime	long: millis	521847163875
unallocatedCapacity	ulong: bytes	3418496

adaptorCount	int	1858
codeBlobType	CodeBlobType	CodeHeap 'non-nmethods'
entryCount	int	1945
fullCount	int	0
methodCount	int	0
reservedTopAddress	ulong: address	5229019136
startAddress	ulong: address	5223170048
startTime	long: millis	443590595000
unallocatedCapacity	ulong: bytes	3409536

adaptorCount	int	1892
codeBlobType	CodeBlobType	CodeHeap 'non-nmethods'
entryCount	int	1981
fullCount	int	0
methodCount	int	0
reservedTopAddress	ulong: address	5631672320
startAddress	ulong: address	5625823232
startTime	long: millis	560112783584
unallocatedCapacity	ulong: bytes	3387392

CodeCacheConfiguration

default profiling startTime end chunk 11 17 20 21

Category: Java Virtual Machine / Code Cache

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	period
default	true	beginChunk
profiling	true	beginChunk

Field	Type	Description
initialSize	ulong: bytes	Initial Size
reservedSize	ulong: bytes	Reserved Size
nonNMethodSize	ulong: bytes	Non-nmethod Size
profiledSize	ulong: bytes	Profiled Size
nonProfiledSize	ulong: bytes	Non-profiled Size
expansionSize	ulong: bytes	Expansion size
minBlockLength	ulong: bytes	Minimum Block Length
startAddress	ulong: address	Start Address
reservedTopAddress	ulong: address	Reserved Top

Examples 3

expansionSize	ulong: bytes	65536
initialSize	ulong: bytes	2555904
minBlockLength	ulong: bytes	6
nonNMethodSize	ulong: bytes	5839564
nonProfiledSize	ulong: bytes	122909338
profiledSize	ulong: bytes	122909338
reservedSize	ulong: bytes	251658240
reservedTopAddress	ulong: address	5754585088
startAddress	ulong: address	5502926848
startTime	long: millis	577731908792

expansionSize	ulong: bytes	65536
initialSize	ulong: bytes	2555904
minBlockLength	ulong: bytes	6
nonNMethodSize	ulong: bytes	5839564
nonProfiledSize	ulong: bytes	122909338
profiledSize	ulong: bytes	122909338
reservedSize	ulong: bytes	251658240
reservedTopAddress	ulong: address	5361434624
startAddress	ulong: address	5109776384
startTime	long: millis	521847164417

expansionSize	ulong: bytes	65536
initialSize	ulong: bytes	2555904
minBlockLength	ulong: bytes	6
nonNMethodSize	ulong: bytes	5839564
nonProfiledSize	ulong: bytes	122909338
profiledSize	ulong: bytes	122909338
reservedSize	ulong: bytes	251658240
reservedTopAddress	ulong: address	5351931904
startAddress	ulong: address	5100273664
startTime	long: millis	448145313833

JVM: Code Sweeper

SweepCodeCache

default profiling startTime duration eventThread 11 17 until JDK 20

Category: Java Virtual Machine / Code Sweeper

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	threshold
default	true	100 ms
profiling	true	100 ms

Field	Type	Description
sweepId	int	Sweep Identifier
sweptCount	uint	Methods Swept
flushedCount	uint	Methods Flushed
zombifiedCount	uint	Methods Zombified

Examples 3

flushedCount	uint	169
startTime	long: millis	596405800417
sweepId	int	103
sweptCount	uint	62860
zombifiedCount	uint	647

flushedCount	uint	213
startTime	long: millis	586374225084
sweepId	int	94
sweptCount	uint	55651
zombifiedCount	uint	154

flushedCount	uint	57
startTime	long: millis	466850918333
sweepId	int	75
sweptCount	uint	43028
zombifiedCount	uint	1

CodeSweeperStatistics

default profiling startTime every chunk 11 17 until JDK 20

Category: Java Virtual Machine / Code Sweeper

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	period
default	true	everyChunk
profiling	true	everyChunk

Field	Type	Description
sweepCount	int	Sweeps
methodReclaimedCount	int	Methods Reclaimed
totalSweepTime	Tickspan	Time Spent Sweeping
peakFractionTime	Tickspan	Peak Time Fraction Sweep
peakSweepTime	Tickspan	Peak Time Full Sweep

Examples 3

methodReclaimedCount	int	21886
peakFractionTime	Tickspan	655459584
peakSweepTime	Tickspan	655459584
startTime	long: millis	591335251209
sweepCount	int	98
totalSweepTime	Tickspan	5979244664

methodReclaimedCount	int	16686
peakFractionTime	Tickspan	547946333
peakSweepTime	Tickspan	547946333
startTime	long: millis	384503772417
sweepCount	int	69
totalSweepTime	Tickspan	3850341706

methodReclaimedCount	int	16227
peakFractionTime	Tickspan	771954083
peakSweepTime	Tickspan	771954083
startTime	long: millis	485004827667
sweepCount	int	69
totalSweepTime	Tickspan	4297142502

CodeSweeperConfiguration

default profiling startTime end chunk 11 17 until JDK 20

Category: Java Virtual Machine / Code Sweeper

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	period
default	true	beginChunk
profiling	true	beginChunk

Field	Type	Description
sweeperEnabled	boolean	Code Sweeper Enabled
flushingEnabled	boolean	Code Cache Flushing Enabled
sweepThreshold	ulong: bytes 17 until JDK 20	Sweep Threshold

Examples 3

flushingEnabled	boolean	true
startTime	long: millis	427348044750
sweepThreshold	ulong: bytes	1258291
sweeperEnabled	boolean	true

flushingEnabled	boolean	true
startTime	long: millis	482012644625
sweepThreshold	ulong: bytes	1258291
sweeperEnabled	boolean	true

flushingEnabled	boolean	true
startTime	long: millis	541955582292
sweepThreshold	ulong: bytes	1258291
sweeperEnabled	boolean	true

JVM: Compiler

Compilation

default profiling startTime duration eventThread 11 17 20 21

Category: Java Virtual Machine / Compiler

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	threshold
default	true	1000 ms
profiling	true	100 ms

Field	Type	Description
compileId	uint	Compilation Identifier
compiler	CompilerType 14+	Compiler Consider contributing a description to jfreventcollector.
method	Method	Method Consider contributing a description to jfreventcollector.
compileLevel	ushort	Compilation Level
succeded	boolean	Succeeded
isOsr	boolean	On Stack Replacement
codeSize	ulong: bytes	Compiled Code Size
inlinedBytes	ulong: bytes	Inlined Code Size

Examples 3

codeSize	ulong: bytes	1528
compileId	uint	68860
compileLevel	ushort	3
compiler	CompilerType	c1
inlinedBytes	ulong: bytes	44
isOsr	boolean	false
method	Method
descriptor	string	()Lscala/collection/Iterator;
hidden	boolean	false
modifiers	int	1
name	string	iterator
type	Class
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/net
hidden	boolean	false
modifiers	int	33
name	string	scala/collection/convert/JavaCollectionWrappers$JSetWrapper
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/net
location	string	null
name	string	null
version	string	null
name	string	scala/collection/convert
startTime	long: millis	470834873417
succeded	boolean	true

codeSize	ulong: bytes	1296
compileId	uint	58940
compileLevel	ushort	3
compiler	CompilerType	c1
inlinedBytes	ulong: bytes	8
isOsr	boolean	false
method	Method
descriptor	string	(Ljava/lang/Object;)Ljava/lang/Object;
hidden	boolean	true
modifiers	int	1
name	string	apply
type	Class
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/net
hidden	boolean	true
modifiers	int	4144
name	string	org.apache.spark.storage.BlockManager$$Lambda$18429+0x0000000804175330/1757535782
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/net
location	string	null
name	string	null
version	string	null
name	string	org/apache/spark/storage
startTime	long: millis	483215071584
succeded	boolean	true

codeSize	ulong: bytes	704
compileId	uint	60374
compileLevel	ushort	3
compiler	CompilerType	c1
inlinedBytes	ulong: bytes	1
isOsr	boolean	false
method	Method
descriptor	string	(Lorg/apache/spark/sql/catalyst/expressions/codegen/CodeAndComment;[Ljava/lang/Object;Lorg/apache/spark/sql/execution/metric/SQLMetric;)V
hidden	boolean	true
modifiers	int	2
name	string	<init>
type	Class
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/net
hidden	boolean	true
modifiers	int	4144
name	string	org.apache.spark.sql.execution.WholeStageCodegenExec$$Lambda$18012+0x00000008040f0000/1677114868
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/net
location	string	null
name	string	null
version	string	null
name	string	org/apache/spark/sql/execution
startTime	long: millis	535792855084
succeded	boolean	true

CompilerPhase

default profiling startTime duration eventThread 11 17 20 21

Category: Java Virtual Machine / Compiler

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	threshold
default	true	60 s
profiling	true	10 s

Field	Type	Description
phase	CompilerPhaseType	Compile Phase
compileId	uint	Compilation Identifier
phaseLevel	ushort	Phase Level

CompilationFailure

profiling startTime eventThread 11 17 20 21

Category: Java Virtual Machine / Compiler

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled
default	false
profiling	true

Field	Type	Description
failureMessage	string	Failure Message
compileId	uint	Compilation Identifier

Examples 3

compileId	uint	74929
failureMessage	string	concurrent class loading
startTime	long: millis	583286002875

compileId	uint	70375
failureMessage	string	concurrent class loading
startTime	long: millis	473461510833

compileId	uint	70411
failureMessage	string	concurrent class loading
startTime	long: millis	576786520292

CompilerInlining

startTime eventThread 11 17 20 21

Category: Java Virtual Machine / Compiler / Optimization

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled
default	false
profiling	false

Field	Type	Description
compileId	uint	Compilation Identifier
caller	Method	Caller Method
callee	CalleeMethod struct	Callee Method
succeeded	boolean	Succeeded
message	string	Message
bci	int	Bytecode Index

Examples 3

bci	int	32
callee	CalleeMethod
descriptor	string	(Ljava/util/Spliterator;Ljava/util/stream/Sink;)Z
name	string	forEachWithCancel
type	string	java/util/stream/ReferencePipeline
caller	Method
descriptor	string	(Ljava/util/stream/Sink;Ljava/util/Spliterator;)Z
hidden	boolean	false
modifiers	int	16
name	string	copyIntoWithCancel
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	1056
name	string	java/util/stream/AbstractPipeline
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/util/stream
compileId	uint	58956
message	string	inline (hot)
startTime	long: millis	483204193959
succeeded	boolean	true

bci	int	133
callee	CalleeMethod
descriptor	string	()Lorg/apache/spark/scheduler/TaskInfo;
name	string	info
type	string	org/apache/spark/status/LiveTask
caller	Method
descriptor	string	()Ljava/lang/Object;
hidden	boolean	false
modifiers	int	1
name	string	doUpdate
type	Class
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/net
hidden	boolean	false
modifiers	int	33
name	string	org/apache/spark/status/LiveTask
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/net
location	string	null
name	string	null
version	string	null
name	string	org/apache/spark/status
compileId	uint	59252
message	string	inline
startTime	long: millis	476713591834
succeeded	boolean	true

bci	int	356
callee	CalleeMethod
descriptor	string	(I)Ljava/lang/Object;
name	string	newArray
type	string	scala/reflect/ClassTag
caller	Method
descriptor	string	(IDLscala/reflect/ClassTag;)V
hidden	boolean	false
modifiers	int	1
name	string	<init>
type	Class
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/net
hidden	boolean	false
modifiers	int	33
name	string	org/apache/spark/util/collection/OpenHashSet
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/net
location	string	null
name	string	null
version	string	null
name	string	org/apache/spark/util/collection
compileId	uint	59180
message	string	no static binding
startTime	long: millis	381380289250
succeeded	boolean	false

Deoptimization

default profiling startTime eventThread stackTrace 14 17 20 21

Category: Java Virtual Machine / Compiler

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	stackTrace
default	true	false
profiling	true	true

Field	Type	Description
compileId	uint	Compilation Identifier
compiler	CompilerType	Compiler Consider contributing a description to jfreventcollector.
method	Method	Method Consider contributing a description to jfreventcollector.
lineNumber	int	Line Number
bci	int	Bytecode Index
instruction	Bytecode	Instruction Consider contributing a description to jfreventcollector.
reason	DeoptimizationReason	Reason Consider contributing a description to jfreventcollector.
action	DeoptimizationAction	Action Consider contributing a description to jfreventcollector.

Examples 3

action	DeoptimizationAction	reinterpret
bci	int	33
compileId	uint	61057
compiler	CompilerType	c2
instruction	Bytecode	if_icmple
lineNumber	int	622
method	Method
descriptor	string	(Ljava/lang/Object;I)Lscala/collection/mutable/HashMap$Node;
hidden	boolean	false
modifiers	int	1
name	string	findNode
type	Class
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/net
hidden	boolean	false
modifiers	int	49
name	string	scala/collection/mutable/HashMap$Node
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/net
location	string	null
name	string	null
version	string	null
name	string	scala/collection/mutable
reason	DeoptimizationReason	unstable_if
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	33
lineNumber	int	622
method	Method
descriptor	string	(Ljava/lang/Object;I)Lscala/collection/mutable/HashMap$Node;
hidden	boolean	false
modifiers	int	1
name	string	findNode
type	Class
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/net
hidden	boolean	false
modifiers	int	49
name	string	scala/collection/mutable/HashMap$Node
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/net
location	string	null
name	string	null
version	string	null
name	string	scala/collection/mutable
type	FrameType	Inlined
		…
truncated	boolean	false
startTime	long: millis	455441380458

action	DeoptimizationAction	maybe_recompile
bci	int	1
compileId	uint	61038
compiler	CompilerType	c2
instruction	Bytecode	instanceof
lineNumber	int	124
method	Method
descriptor	string	()I
hidden	boolean	false
modifiers	int	17
name	string	length
type	Class
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/net
hidden	boolean	false
modifiers	int	1057
name	string	scala/collection/immutable/Vector
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/net
location	string	null
name	string	null
version	string	null
name	string	scala/collection/immutable
reason	DeoptimizationReason	speculate_class_check
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	1
lineNumber	int	124
method	Method
descriptor	string	()I
hidden	boolean	false
modifiers	int	17
name	string	length
type	Class
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/net
hidden	boolean	false
modifiers	int	1057
name	string	scala/collection/immutable/Vector
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/net
location	string	null
name	string	null
version	string	null
name	string	scala/collection/immutable
type	FrameType	Inlined
		…
truncated	boolean	false
startTime	long: millis	543767887292

action	DeoptimizationAction	reinterpret
bci	int	31
compileId	uint	60937
compiler	CompilerType	c2
instruction	Bytecode	if_icmpeq
lineNumber	int	653
method	Method
descriptor	string	()I
hidden	boolean	false
modifiers	int	1
name	string	next
type	Class
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/net
hidden	boolean	false
modifiers	int	33
name	string	scala/collection/immutable/RangeIterator
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/net
location	string	null
name	string	null
version	string	null
name	string	scala/collection/immutable
reason	DeoptimizationReason	unstable_if
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	31
lineNumber	int	653
method	Method
descriptor	string	()I
hidden	boolean	false
modifiers	int	1
name	string	next
type	Class
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/net
hidden	boolean	false
modifiers	int	33
name	string	scala/collection/immutable/RangeIterator
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	null
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/net/URLClassLoader
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/net
location	string	null
name	string	null
version	string	null
name	string	scala/collection/immutable
type	FrameType	Inlined
		…
truncated	boolean	false
startTime	long: millis	559147054834

CompilerStatistics

default profiling startTime every chunk 11 17 20 21

Category: Java Virtual Machine / Compiler

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	period
default	true	1000 ms
profiling	true	1000 ms

Field	Type	Description
compileCount	int	Compiled Methods
bailoutCount	int	Bailouts
invalidatedCount	int	Invalidated Compilations
osrCompileCount	int	OSR Compilations
standardCompileCount	int	Standard Compilations
osrBytesCompiled	ulong: bytes	OSR Bytes Compiled
standardBytesCompiled	ulong: bytes	Standard Bytes Compiled
nmethodsSize	ulong: bytes	Compilation Resulting Size
nmethodCodeSize	ulong: bytes	Compilation Resulting Code Size
peakTimeSpent	long: millis	Peak Time
totalTimeSpent	long: millis	Total time

Examples 3

bailoutCount	int	10
compileCount	int	56413
invalidatedCount	int	0
nmethodCodeSize	ulong: bytes	70091584
nmethodsSize	ulong: bytes	113358216
osrBytesCompiled	ulong: bytes	0
osrCompileCount	int	626
peakTimeSpent	long: millis	9368
standardBytesCompiled	ulong: bytes	0
standardCompileCount	int	55787
startTime	long: millis	455263489542
totalTimeSpent	long: millis	509010

bailoutCount	int	8
compileCount	int	57206
invalidatedCount	int	0
nmethodCodeSize	ulong: bytes	76007104
nmethodsSize	ulong: bytes	118807632
osrBytesCompiled	ulong: bytes	0
osrCompileCount	int	617
peakTimeSpent	long: millis	19331
standardBytesCompiled	ulong: bytes	0
standardCompileCount	int	56589
startTime	long: millis	544900258750
totalTimeSpent	long: millis	449463

bailoutCount	int	11
compileCount	int	67404
invalidatedCount	int	0
nmethodCodeSize	ulong: bytes	83136960
nmethodsSize	ulong: bytes	132879488
osrBytesCompiled	ulong: bytes	0
osrCompileCount	int	726
peakTimeSpent	long: millis	20643
standardBytesCompiled	ulong: bytes	0
standardCompileCount	int	66678
startTime	long: millis	581749585834
totalTimeSpent	long: millis	758596

CompilerConfiguration

default profiling startTime end chunk 11 17 20 21

Category: Java Virtual Machine / Compiler

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	period
default	true	beginChunk
profiling	true	beginChunk

Field	Type	Description
threadCount	int	Thread Count
tieredCompilation	boolean	Tiered Compilation

Examples 3

startTime	long: millis	484973173292
threadCount	int	4
tieredCompilation	boolean	true

startTime	long: millis	487898205084
threadCount	int	4
tieredCompilation	boolean	true

startTime	long: millis	521847160875
threadCount	int	4
tieredCompilation	boolean	true

JVM: Diagnostics

SyncOnValueBasedClass

experimental default profiling startTime eventThread stackTrace 16 17 20 21

Category: Java Virtual Machine / Diagnostics

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	stackTrace
default	true	true
profiling	true	true

Field	Type	Description
valueBasedClass	Class	Value Based Class Consider contributing a description to jfreventcollector.

HeapDump

default profiling startTime duration eventThread stackTrace 15 17 20 21

Category: Java Virtual Machine / Diagnostics

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	stackTrace	threshold
default	true	true	0 ns
profiling	true	true	0 ns

Field	Type	Description
destination	string	Destination
size	long	Size
gcBeforeDump	boolean	GC Before Dump
onOutOfMemoryError	boolean	On Out of Memory Error

JVM: Flag

IntFlagChanged

default profiling startTime 11 17 20 21

Category: Java Virtual Machine / Flag

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled
default	true
profiling	true

Field	Type	Description
name	string	Name
oldValue	int	Old Value
newValue	int	New Value
origin	FlagValueOrigin	Origin Consider contributing a description to jfreventcollector.

UnsignedIntFlagChanged

default profiling startTime 11 17 20 21

Category: Java Virtual Machine / Flag

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled
default	true
profiling	true

Field	Type	Description
name	string	Name
oldValue	uint	Old Value
newValue	uint	New Value
origin	FlagValueOrigin	Origin Consider contributing a description to jfreventcollector.

LongFlagChanged

default profiling startTime 11 17 20 21

Category: Java Virtual Machine / Flag

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled
default	true
profiling	true

Field	Type	Description
name	string	Name
oldValue	long	Old Value
newValue	long	New Value
origin	FlagValueOrigin	Origin Consider contributing a description to jfreventcollector.

UnsignedLongFlagChanged

default profiling startTime 11 17 20 21

Category: Java Virtual Machine / Flag

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled
default	true
profiling	true

Field	Type	Description
name	string	Name
oldValue	ulong	Old Value
newValue	ulong	New Value
origin	FlagValueOrigin	Origin Consider contributing a description to jfreventcollector.

DoubleFlagChanged

default profiling startTime 11 17 20 21

Category: Java Virtual Machine / Flag

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled
default	true
profiling	true

Field	Type	Description
name	string	Name
oldValue	double	Old Value
newValue	double	New Value
origin	FlagValueOrigin	Origin Consider contributing a description to jfreventcollector.

BooleanFlagChanged

default profiling startTime 11 17 20 21

Category: Java Virtual Machine / Flag

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled
default	true
profiling	true

Field	Type	Description
name	string	Name
oldValue	boolean	Old Value
newValue	boolean	New Value
origin	FlagValueOrigin	Origin Consider contributing a description to jfreventcollector.

StringFlagChanged

default profiling startTime 11 17 20 21

Category: Java Virtual Machine / Flag

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled
default	true
profiling	true

Field	Type	Description
name	string	Name
oldValue	string	Old Value
newValue	string	New Value
origin	FlagValueOrigin	Origin Consider contributing a description to jfreventcollector.

IntFlag

default profiling startTime duration end chunk 11 17 20 21

Category: Java Virtual Machine / Flag

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	period
default	true	beginChunk
profiling	true	beginChunk

Field	Type	Description
name	string	Name
value	int	Value
origin	FlagValueOrigin	Origin Consider contributing a description to jfreventcollector.

Examples 3

name	string	VerifyMetaspaceInterval
origin	FlagValueOrigin	Default
startTime	long: millis	494847543750
value	int	0

name	string	SoftwarePrefetchHintDistance
origin	FlagValueOrigin	Default
startTime	long: millis	400854168000
value	int	384

name	string	ActiveProcessorCount
origin	FlagValueOrigin	Default
startTime	long: millis	483215026792
value	int	-1

UnsignedIntFlag

default profiling startTime duration end chunk 11 17 20 21

Category: Java Virtual Machine / Flag

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	period
default	true	beginChunk
profiling	true	beginChunk

Field	Type	Description
name	string	Name
value	uint	Value
origin	FlagValueOrigin	Origin Consider contributing a description to jfreventcollector.

Examples 3

name	string	StringDeduplicationAgeThreshold
origin	FlagValueOrigin	Default
startTime	long: millis	535419028000
value	uint	3

name	string	MarkSweepAlwaysCompactCount
origin	FlagValueOrigin	Default
startTime	long: millis	429031426333
value	uint	4

name	string	MarkSweepAlwaysCompactCount
origin	FlagValueOrigin	Default
startTime	long: millis	541955592834
value	uint	4

LongFlag

default profiling startTime duration end chunk 11 17 20 21

Category: Java Virtual Machine / Flag

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	period
default	true	beginChunk
profiling	true	beginChunk

Field	Type	Description
name	string	Name
value	long	Value
origin	FlagValueOrigin	Origin Consider contributing a description to jfreventcollector.

Examples 3

name	string	LoopUnrollMin
origin	FlagValueOrigin	Default
startTime	long: millis	476739517292
value	long	4

name	string	C1MaxInlineSize
origin	FlagValueOrigin	Default
startTime	long: millis	381397823042
value	long	35

name	string	FLOATPRESSURE
origin	FlagValueOrigin	Default
startTime	long: millis	483215034042
value	long	-1

UnsignedLongFlag

default profiling startTime duration end chunk 11 17 20 21

Category: Java Virtual Machine / Flag

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	period
default	true	beginChunk
profiling	true	beginChunk

Field	Type	Description
name	string	Name
value	ulong	Value
origin	FlagValueOrigin	Origin Consider contributing a description to jfreventcollector.

Examples 3

name	string	TenuredGenerationSizeIncrement
origin	FlagValueOrigin	Default
startTime	long: millis	381397951458
value	ulong	20

name	string	PromotionFailureALotInterval
origin	FlagValueOrigin	Default
startTime	long: millis	476739536500
value	ulong	5

name	string	G1DummyRegionsPerGC
origin	FlagValueOrigin	Default
startTime	long: millis	483215052167
value	ulong	0

DoubleFlag

default profiling startTime duration end chunk 11 17 20 21

Category: Java Virtual Machine / Flag

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	period
default	true	beginChunk
profiling	true	beginChunk

Field	Type	Description
name	string	Name
value	double	Value
origin	FlagValueOrigin	Origin Consider contributing a description to jfreventcollector.

Examples 3

name	string	G1ConcMarkStepDurationMillis
origin	FlagValueOrigin	Default
startTime	long: millis	427348111292
value	double	10.0

name	string	G1ConcMarkStepDurationMillis
origin	FlagValueOrigin	Default
startTime	long: millis	508781153584
value	double	10.0

name	string	G1PeriodicGCSystemLoadThreshold
origin	FlagValueOrigin	Default
startTime	long: millis	504514656375
value	double	0.0

BooleanFlag

default profiling startTime duration end chunk 11 17 20 21

Category: Java Virtual Machine / Flag

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	period
default	true	beginChunk
profiling	true	beginChunk

Field	Type	Description
name	string	Name
value	boolean	Value
origin	FlagValueOrigin	Origin Consider contributing a description to jfreventcollector.

Examples 3

name	string	PrintOptoInlining
origin	FlagValueOrigin	Default
startTime	long: millis	381398045708
value	boolean	false

name	string	PrintStringTableStatistics
origin	FlagValueOrigin	Default
startTime	long: millis	476739577042
value	boolean	false

name	string	SelectivePhiFunctions
origin	FlagValueOrigin	Default
startTime	long: millis	483215069584
value	boolean	true

StringFlag

default profiling startTime duration end chunk 11 17 20 21

Category: Java Virtual Machine / Flag

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	period
default	true	beginChunk
profiling	true	beginChunk

Field	Type	Description
name	string	Name
value	string	Value
origin	FlagValueOrigin	Origin Consider contributing a description to jfreventcollector.

Examples 3

name	string	ShenandoahGCMode
origin	FlagValueOrigin	Default
startTime	long: millis	390610012292
value	string	satb

name	string	OnError
origin	FlagValueOrigin	Default
startTime	long: millis	489885160625
value	string

name	string	CompilationMode
origin	FlagValueOrigin	Default
startTime	long: millis	482012747542
value	string	default

JVM: GC: Collector

GarbageCollection

default profiling startTime duration 11 17 20 21

Category: Java Virtual Machine / GC / Collector

Garbage collection performed by the JVM

Configuration	enabled	threshold
default	true	0 ms
profiling	true	0 ms

Field	Type	Description
gcId	uint	GC Identifier
name	GCName	Name The name of the Garbage Collector
cause	GCCause	Cause The reason for triggering this Garbage Collection
sumOfPauses	Tickspan	Sum of Pauses Sum of all the times in which Java execution was paused during the garbage collection
longestPause	Tickspan	Longest Pause Longest individual pause during the garbage collection

Examples 3

cause	GCCause	Heap Inspection Initiated GC
gcId	uint	857
longestPause	Tickspan	1050659084
name	GCName	G1Full
startTime	long: millis	558813531875
sumOfPauses	Tickspan	1050659084

cause	GCCause	Heap Inspection Initiated GC
gcId	uint	529
longestPause	Tickspan	2113125
name	GCName	ParallelScavenge
startTime	long: millis	572348513667
sumOfPauses	Tickspan	2113125

cause	GCCause	Heap Inspection Initiated GC
gcId	uint	716
longestPause	Tickspan	385094208
name	GCName	SerialOld
startTime	long: millis	427348448417
sumOfPauses	Tickspan	385094208

SystemGC

default profiling startTime duration eventThread stackTrace 17 20 21

Category: Java Virtual Machine / GC / Collector

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled	stackTrace	threshold
default	true	true	0 ms
profiling	true	true	0 ms

Field	Type	Description
invokedConcurrent	boolean	Invoked Concurrent

Examples 3

invokedConcurrent	boolean	false
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	0
lineNumber	int	-1
method	Method
descriptor	string	()V
hidden	boolean	false
modifiers	int	257
name	string	gc
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/lang/Runtime
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/lang
type	FrameType	Native
		…
truncated	boolean	false
startTime	long: millis	581139985625

invokedConcurrent	boolean	false
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	0
lineNumber	int	-1
method	Method
descriptor	string	()V
hidden	boolean	false
modifiers	int	257
name	string	gc
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/lang/Runtime
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/lang
type	FrameType	Native
		…
truncated	boolean	false
startTime	long: millis	473466034167

invokedConcurrent	boolean	false
stackTrace	StackTrace
frames	StackFrame
bytecodeIndex	int	0
lineNumber	int	-1
method	Method
descriptor	string	()V
hidden	boolean	false
modifiers	int	257
name	string	gc
type	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/lang/Runtime
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/lang
type	FrameType	Native
		…
truncated	boolean	false
startTime	long: millis	594985916375

ParallelOldGarbageCollection

default profiling startTime duration 11 17 20 21

Category: Java Virtual Machine / GC / Collector

Appearing in: ParallelGC

Missing in: G1GC, SerialGC, ShenandoahGC, ZGC

Extra information specific to Parallel Old Garbage Collections

Configuration	enabled	threshold
default	true	0 ms
profiling	true	0 ms

Field	Type	Description
gcId	uint	GC Identifier
densePrefix	ulong: address	Dense Prefix The address of the dense prefix, used when compacting

Examples 1

ParallelGC

densePrefix	ulong: address	30246699008
gcId	uint	566
startTime	long: millis	596465771042

YoungGarbageCollection

default profiling startTime duration 11 17 20 21

Category: Java Virtual Machine / GC / Collector

Appearing in: G1GC, ParallelGC, SerialGC

Missing in: ShenandoahGC, ZGC

Extra information specific to Young Garbage Collections

Configuration	enabled	threshold
default	true	0 ms
profiling	true	0 ms

Field	Type	Description
gcId	uint	GC Identifier
tenuringThreshold	uint	Tenuring Threshold

Examples 3

gcId	uint	535
startTime	long: millis	576791695250
tenuringThreshold	uint	15

gcId	uint	875
startTime	long: millis	574434064334
tenuringThreshold	uint	15

gcId	uint	817
startTime	long: millis	479786481542
tenuringThreshold	uint	15

OldGarbageCollection

default profiling startTime duration 11 17 20 21

Category: Java Virtual Machine / GC / Collector

Appearing in: G1GC, ParallelGC, SerialGC

Missing in: ShenandoahGC, ZGC

Extra information specific to Old Garbage Collections

Configuration	enabled	threshold
default	true	0 ms
profiling	true	0 ms

Field	Type	Description
gcId	uint	GC Identifier

Examples 3

gcId	uint	882
startTime	long: millis	575344582959

gcId	uint	552
startTime	long: millis	585681715334

gcId	uint	709
startTime	long: millis	384503937125

G1GarbageCollection

default profiling startTime duration 11 17 20 21

Category: Java Virtual Machine / GC / Collector

Appearing in: G1GC

Missing in: ParallelGC, SerialGC, ShenandoahGC, ZGC

Extra information specific to G1 Young Garbage Collections

Configuration	enabled	threshold
default	true	0 ms
profiling	true	0 ms

Field	Type	Description
gcId	uint	GC Identifier
type	G1YCType	Type Consider contributing a description to jfreventcollector.

Examples 1

G1GC

gcId	uint	816
startTime	long: millis	539558539084
type	G1YCType	Mixed

JVM: GC: Configuration

GCConfiguration

default profiling startTime duration end chunk 11 17 20 21

Category: Java Virtual Machine / GC / Configuration

The configuration of the garbage collector

Configuration	enabled	period
default	true	everyChunk
profiling	true	everyChunk

Field	Type	Description
youngCollector	GCName	Young Garbage Collector The garbage collector used for the young generation
oldCollector	GCName	Old Garbage Collector The garbage collector used for the old generation
parallelGCThreads	uint	Parallel GC Threads Number of parallel threads to use for garbage collection
concurrentGCThreads	uint	Concurrent GC Threads Number of concurrent threads to use for garbage collection
usesDynamicGCThreads	boolean	Uses Dynamic GC Threads Whether a dynamic number of GC threads are used or not
isExplicitGCConcurrent	boolean	Concurrent Explicit GC Whether System.gc() is concurrent or not
isExplicitGCDisabled	boolean	Disabled Explicit GC Whether System.gc() will cause a garbage collection or not
pauseTarget	long: millis	Pause Target Target for GC pauses
gcTimeRatio	uint	GC Time Ratio Target for runtime vs garbage collection time

Examples 3

concurrentGCThreads	uint	0
gcTimeRatio	uint	99
isExplicitGCConcurrent	boolean	false
isExplicitGCDisabled	boolean	false
oldCollector	GCName	ParallelOld
parallelGCThreads	uint	8
pauseTarget	long: millis	-9223372036854775808
startTime	long: millis	549472041209
usesDynamicGCThreads	boolean	true
youngCollector	GCName	ParallelScavenge

concurrentGCThreads	uint	0
gcTimeRatio	uint	99
isExplicitGCConcurrent	boolean	false
isExplicitGCDisabled	boolean	false
oldCollector	GCName	SerialOld
parallelGCThreads	uint	0
pauseTarget	long: millis	-9223372036854775808
startTime	long: millis	485363677625
usesDynamicGCThreads	boolean	true
youngCollector	GCName	DefNew

concurrentGCThreads	uint	2
gcTimeRatio	uint	12
isExplicitGCConcurrent	boolean	false
isExplicitGCDisabled	boolean	false
oldCollector	GCName	G1Old
parallelGCThreads	uint	8
pauseTarget	long: millis	-9223372036854775808
startTime	long: millis	584786649000
usesDynamicGCThreads	boolean	true
youngCollector	GCName	G1New

GCSurvivorConfiguration

default profiling startTime duration end chunk 11 17 20 21

Category: Java Virtual Machine / GC / Configuration

The configuration of the survivors of garbage collection

Configuration	enabled	period
default	true	beginChunk
profiling	true	beginChunk

Field	Type	Description
maxTenuringThreshold	ubyte	Maximum Tenuring Threshold Upper limit for the age of how old objects to keep in the survivor area
initialTenuringThreshold	ubyte	Initial Tenuring Threshold Initial age limit for how old objects to keep in survivor area

Examples 3

initialTenuringThreshold	ubyte	7
maxTenuringThreshold	ubyte	15
startTime	long: millis	563210583667

initialTenuringThreshold	ubyte	7
maxTenuringThreshold	ubyte	15
startTime	long: millis	586190014584

initialTenuringThreshold	ubyte	7
maxTenuringThreshold	ubyte	15
startTime	long: millis	416449449292

GCTLABConfiguration

default profiling startTime duration end chunk 11 17 20 21

Category: Java Virtual Machine / GC / Configuration

The configuration of the Thread Local Allocation Buffers (TLABs)

Configuration	enabled	period
default	true	beginChunk
profiling	true	beginChunk

Field	Type	Description
usesTLABs	boolean	TLABs Used If Thread Local Allocation Buffers (TLABs) are in use
minTLABSize	ulong: bytes	Minimum TLAB Size
tlabRefillWasteLimit	ulong: bytes	TLAB Refill Waste Limit

Examples 3

minTLABSize	ulong: bytes	2048
startTime	long: millis	577916863750
tlabRefillWasteLimit	ulong: bytes	64
usesTLABs	boolean	true

minTLABSize	ulong: bytes	2048
startTime	long: millis	592068605292
tlabRefillWasteLimit	ulong: bytes	64
usesTLABs	boolean	true

minTLABSize	ulong: bytes	2048
startTime	long: millis	488771401375
tlabRefillWasteLimit	ulong: bytes	64
usesTLABs	boolean	true

GCHeapConfiguration

default profiling startTime duration end chunk 11 17 20 21

Category: Java Virtual Machine / GC / Configuration

The configuration of the garbage collected heap

Configuration	enabled	period
default	true	beginChunk
profiling	true	beginChunk

Field	Type	Description
minSize	ulong: bytes	Minimum Heap Size
maxSize	ulong: bytes	Maximum Heap Size
initialSize	ulong: bytes	Initial Heap Size
usesCompressedOops	boolean	If Compressed Oops Are Used If compressed Oops (Ordinary Object Pointers) are enabled
compressedOopsMode	NarrowOopMode	Compressed Oops Mode The kind of compressed oops being used
objectAlignment	ulong: bytes	Object Alignment Object alignment (in bytes) on the heap
heapAddressBits	ubyte	Heap Address Size Heap Address Size (in bits)

Examples 3

compressedOopsMode	NarrowOopMode	Zero based
heapAddressBits	ubyte	32
initialSize	ulong: bytes	268435456
maxSize	ulong: bytes	4294967296
minSize	ulong: bytes	8388608
objectAlignment	ulong: bytes	8
startTime	long: millis	507758311917
usesCompressedOops	boolean	true

compressedOopsMode	NarrowOopMode	Zero based
heapAddressBits	ubyte	32
initialSize	ulong: bytes	268435456
maxSize	ulong: bytes	4294967296
minSize	ulong: bytes	8388608
objectAlignment	ulong: bytes	8
startTime	long: millis	547799565792
usesCompressedOops	boolean	true

compressedOopsMode	NarrowOopMode	Zero based
heapAddressBits	ubyte	32
initialSize	ulong: bytes	268435456
maxSize	ulong: bytes	4294967296
minSize	ulong: bytes	8388608
objectAlignment	ulong: bytes	8
startTime	long: millis	485363679542
usesCompressedOops	boolean	true

YoungGenerationConfiguration

default profiling startTime duration end chunk 11 17 20 21

Category: Java Virtual Machine / GC / Configuration

The configuration of the young generation of the garbage collected heap

Configuration	enabled	period
default	true	beginChunk
profiling	true	beginChunk

Field	Type	Description
minSize	ulong: bytes	Minimum Young Generation Size
maxSize	ulong: bytes	Maximum Young Generation Size
newRatio	uint	New Ratio The size of the young generation relative to the tenured generation

Examples 3

maxSize	ulong: bytes	2575302656
minSize	ulong: bytes	1363144
newRatio	uint	2
startTime	long: millis	504726590667

maxSize	ulong: bytes	1431306240
minSize	ulong: bytes	89128960
newRatio	uint	2
startTime	long: millis	547799566584

maxSize	ulong: bytes	1431633920
minSize	ulong: bytes	89456640
newRatio	uint	2
startTime	long: millis	427733751375

JVM: GC: Detailed

ZThreadDebug

internal startTime duration eventThread 18 20 21

Category: Java Virtual Machine / GC / Detailed

Temporary latency measurements used during development and debugging of ZGC

Only valid for the ZGC.

Field	Type	Description
gcId	uint	GC Identifier
name	string	Name The name of the GC runner

G1MMU

default profiling startTime 11 17 20 21

Category: Java Virtual Machine / GC / Detailed

Appearing in: G1GC

Missing in: ParallelGC, SerialGC, ShenandoahGC, ZGC

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled
default	true
profiling	true

Field	Type	Description
gcId	uint	GC Identifier
timeSlice	long: millis	Time Slice Time slice used to calculate MMU
gcTime	long: millis	GC Time Time stopped because of GC during last time slice
pauseTarget	long: millis	Pause Target Max time allowed to be spent on GC during last time slice

Examples 1

G1GC

gcId	uint	826
gcTime	long: millis	32
pauseTarget	long: millis	200
startTime	long: millis	542433489875
timeSlice	long: millis	201

EvacuationInformation

default profiling startTime 11 17 20 21

Category: Java Virtual Machine / GC / Detailed

Appearing in: G1GC

Missing in: ParallelGC, SerialGC, ShenandoahGC, ZGC

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled
default	true
profiling	true

Field	Type	Description
gcId	uint	GC Identifier
cSetRegions	uint	Collection Set Regions
cSetUsedBefore	ulong: bytes	Collection Set Before Memory usage before GC in the collection set regions
cSetUsedAfter	ulong: bytes	Collection Set After Memory usage after GC in the collection set regions
allocationRegions	uint	Allocation Regions Regions chosen as allocation regions during evacuation (includes survivors and old space regions)
allocationRegionsUsedBefore	ulong: bytes	Allocation Regions Before Memory usage before GC in allocation regions
allocationRegionsUsedAfter	ulong: bytes	Allocation Regions After Memory usage after GC in allocation regions
bytesCopied	ulong: bytes	Bytes Copied
regionsFreed	uint	Regions Freed

Examples 1

G1GC

allocationRegions	uint	3
allocationRegionsUsedAfter	ulong: bytes	4785840
allocationRegionsUsedBefore	ulong: bytes	1352192
bytesCopied	ulong: bytes	3433648
cSetRegions	uint	398
cSetUsedAfter	ulong: bytes	0
cSetUsedBefore	ulong: bytes	832795064
gcId	uint	912
regionsFreed	uint	398
startTime	long: millis	616330253750

ObjectCountAfterGC

startTime 11 17 20 21

Category: Java Virtual Machine / GC / Detailed

Appearing in: G1GC, ParallelGC, SerialGC

Missing in: ShenandoahGC, ZGC

No additional description available. Write your own and contribute it to jfreventcollector or directly to the OpenJDK.

Configuration	enabled
default	false
profiling	false

Field	Type	Description
gcId	uint	GC Identifier
objectClass	Class	Object Class Consider contributing a description to jfreventcollector.
count	long	Count
totalSize	ulong: bytes	Total Size

Examples 3

count	long	1465192
gcId	uint	708
objectClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	49
name	string	java/lang/String
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/lang
startTime	long: millis	381687323667
totalSize	ulong: bytes	35164608

count	long	93257
gcId	uint	462
objectClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	33
name	string	java/lang/Object
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/lang
startTime	long: millis	490059410250
totalSize	ulong: bytes	1492112

count	long	207845
gcId	uint	767
objectClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	32
name	string	java/util/concurrent/ConcurrentHashMap$Node
package	Package
exported	boolean	true
module	Module
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
location	string	jrt:/java.base
name	string	java.base
version	string	19
name	string	java/util/concurrent
startTime	long: millis	479650512167
totalSize	ulong: bytes	6651040

G1EvacuationYoungStatistics

default profiling startTime 11 17 20 21

Category: Java Virtual Machine / GC / Detailed

Appearing in: G1GC

Missing in: ParallelGC, SerialGC, ShenandoahGC, ZGC

Memory related evacuation statistics during GC for the young generation

Configuration	enabled
default	true
profiling	true

Field	Type	Description
statistics	G1EvacuationStatistics struct	Evacuation Statistics

Examples 1

G1GC

startTime	long: millis	578106380584
statistics	G1EvacuationStatistics
allocated	ulong: bytes	5817792
directAllocated	ulong: bytes	65552
failureUsed	ulong: bytes	0
failureWaste	ulong: bytes	0
gcId	uint	888
regionEndWaste	ulong: bytes	0
regionsRefilled	uint: bytes	3
undoWaste	ulong: bytes	0
used	ulong: bytes	5306528
wasted	ulong: bytes	1032

G1EvacuationOldStatistics

default profiling startTime 11 17 20 21

Category: Java Virtual Machine / GC / Detailed

Appearing in: G1GC

Missing in: ParallelGC, SerialGC, ShenandoahGC, ZGC

Memory related evacuation statistics during GC for the old generation

Configuration	enabled
default	true
profiling	true

Field	Type	Description
statistics	G1EvacuationStatistics struct	Evacuation Statistics

Examples 1

G1GC

startTime	long: millis	555156635917
statistics	G1EvacuationStatistics
allocated	ulong: bytes	0
directAllocated	ulong: bytes	0
failureUsed	ulong: bytes	0
failureWaste	ulong: bytes	0
gcId	uint	849
regionEndWaste	ulong: bytes	0
regionsRefilled	uint: bytes	1
undoWaste	ulong: bytes	0
used	ulong: bytes	0
wasted	ulong: bytes	0

G1BasicIHOP

default profiling startTime 11 17 20 21

Category: Java Virtual Machine / GC / Detailed

Appearing in: G1GC

Missing in: ParallelGC, SerialGC, ShenandoahGC, ZGC

Basic statistics related to current IHOP calculation

Configuration	enabled
default	true
profiling	true

Field	Type	Description
gcId	uint	GC Identifier
threshold	ulong: bytes	Current IHOP Threshold Current IHOP threshold
thresholdPercentage	float: percentage	Current IHOP Threshold Current IHOP threshold in percent of old generation
targetOccupancy	ulong: bytes	Target Occupancy Target old generation occupancy to reach at the start of mixed GC
currentOccupancy	ulong: bytes	Current Occupancy Current old generation occupancy
recentMutatorAllocationSize	ulong: bytes	Recent Mutator Allocation Size Mutator allocation during mutator operation in the most recent interval
recentMutatorDuration	long: millis	Recent Mutator Duration Time the mutator ran in the most recent interval
recentAllocationRate	double: bytes-per-second	Recent Allocation Rate Allocation rate of the mutator in the most recent interval in bytes/second
lastMarkingDuration	long: millis	Last Marking Duration Last time from the end of the last concurrent start to the first mixed GC

Examples 1

G1GC

currentOccupancy	ulong: bytes	247756976
gcId	uint	864
lastMarkingDuration	long: millis	1235
recentAllocationRate	double: bytes-per-second	0.0
recentMutatorAllocationSize	ulong: bytes	0
recentMutatorDuration	long: millis	4559
startTime	long: millis	567782914500
targetOccupancy	ulong: bytes	826277888
threshold	ulong: bytes	44777684
thresholdPercentage	float: percentage	0.05419204

G1AdaptiveIHOP

default profiling startTime 11 17 20 21

Category: Java Virtual Machine / GC / Detailed

Appearing in: G1GC

Missing in: ParallelGC, SerialGC, ShenandoahGC, ZGC

Statistics related to current adaptive IHOP calculation

Configuration	enabled
default	true
profiling	true

Field	Type	Description
gcId	uint	GC Identifier
threshold	ulong: bytes	Threshold Current IHOP Threshold
thresholdPercentage	float: percentage	Threshold Current IHOP threshold in percent of the internal target occupancy
ihopTargetOccupancy	ulong: bytes	IHOP Target Occupancy Internal target old generation occupancy to reach at the start of mixed GC
currentOccupancy	ulong: bytes	Current Occupancy Current old generation occupancy
additionalBufferSize	ulong: bytes	Additional Buffer Additional buffer size
predictedAllocationRate	double: bytes-per-second	Predicted Allocation Rate Current predicted allocation rate for the mutator in bytes/second
predictedMarkingDuration	long: millis	Predicted Marking Duration Current predicted time from the end of the last concurrent start to the first mixed GC
predictionActive	boolean	Prediction Active Indicates whether the adaptive IHOP prediction is active

Examples 1

G1GC

additionalBufferSize	ulong: bytes	0
currentOccupancy	ulong: bytes	200035000
gcId	uint	891
ihopTargetOccupancy	ulong: bytes	605657497
predictedAllocationRate	double: bytes-per-second	1.436246081707775E8
predictedMarkingDuration	long: millis	1386
predictionActive	boolean	true
startTime	long: millis	578436930042
threshold	ulong: bytes	406518234
thresholdPercentage	float: percentage	0.6712015

PromoteObjectInNewPLAB

profiling startTime eventThread 11 17 20 21

Category: Java Virtual Machine / GC / Detailed

Appearing in: G1GC, ParallelGC

Missing in: SerialGC, ShenandoahGC, ZGC

Object survived scavenge and was copied to a new Promotion Local Allocation Buffer (PLAB). Supported GCs are Parallel Scavange, G1 and CMS with Parallel New. Due to promotion being done in parallel an object might be reported multiple times as the GC threads race to copy all objects.

Configuration	enabled
default	false
profiling	true

Field	Type	Description
gcId	uint	GC Identifier Identifier signifying GC during which the object was promoted
objectClass	Class	Object Class Class of promoted object
objectSize	ulong: bytes	Object Size Size of promoted object
tenuringAge	uint	Object Tenuring Age Tenuring age of a surviving object before being copied. The tenuring age of an object is a value between 0-15 and is incremented each scavange the object survives. Newly allocated objects have tenuring age 0.
tenured	boolean	Tenured True if object was promoted to Old space, otherwise the object was aged and copied to a Survivor space
plabSize	ulong: bytes	PLAB Size Size of the allocated PLAB to which the object was copied

Examples 2

ParallelGC
G1GC

gcId	uint	457
objectClass	Class
classLoader	ClassLoader
name	string	bootstrap
type	Class	null
hidden	boolean	false
modifiers	int	0
name	string	[F
package	Package	null
objectSize	ulong: bytes	56
plabSize	ulong: bytes	32752
startTime	long: millis	483215886667
tenured	boolean	false