Java virtual machine counters

Java virtual machine counters

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You can use the JVM counters that the PMI and TPV collect to monitor JVM performance.
The total, used, and free heap size counters are available without any additional configuration settings. The remaining counters are available only when a Java virtual machine profiler is enabled.

Name Key Description Granularity Type Level Overhead
CpuUsage jvmRuntimeModule.cpuUsage Average percent of CPU usage since the last query Per JVM CountStatistic Basic Low
FreeMemory jvmRuntimeModule.freeMemory Free memory in the JVM run time Per JVM CountStatistic Extended Low
UsedMemory jvmRuntimeModule.usedMemory Used memory in the JVM run time Per JVM CountStatistic Basic Low
HeapSize jvmRuntimeModule.totalMemory Total memory in the JVM run time Per JVM BoundedRangeStatistic. The upperBound and lowerBound are not implemented for the Total memory counter. Basic High
UpTime jvmRuntimeModule.upTime Amount of time that the JVM is running Per JVM CountStatistic Basic Low
GCCount jvmRuntimeModule.numGcCalls Number of garbage collection calls.
This counter is not available unless the JVM profiler is enabled.
Per JVM CountStatistic All Max
GCIntervalTime jvmRuntimeModule.avgTimeBetweenGcCalls Average garbage collection value in seconds between two garbage collections.
This counter is not available unless the JVM profiler is enabled.
Per JVM TimeStatistic All Max
GCTime jvmRuntimeModule.avgGcDuration Average duration of a garbage collection.
This counter is not available unless the JVM profiler is enabled.
Per JVM TimeStatistic All Max
WaitsForLockCount jvmRuntimeModule.numWaitsForLock Number of times that a thread waits for a lock.
This counter is not available unless the JVM profiler is enabled.
Per JVM CountStatistic All Max
WaitForLockTime jvmRuntimeModule.avgTimeWaitForLock Average time that a thread waits for a lock.
This counter is not available unless the JVM profiler is enabled.
Per JVM TimeStatistic All Max
ThreadStartedCount jvmRuntimeModule.numThreadsStarted Number of threads started.
This counter is not available unless the JVM profiler is enabled.
Per JVM CountStatistic All Max
ThreadEndedCount jvmRuntimeModule.numThreadsDead Number of failed threads.
This counter is not available unless the JVM profiler is enabled.
Per JVM CountStatistic All Max

ObjectAllocateCount jvmRuntimeModule.numObjectsAllocated
This counter is deprecated in 6.1.
Number of objects that are allocated in the heap.
This counter is not available unless the -XrunpmiJvmpiProfiler option is set when starting the JVM.
From 4.0 to 6.0.x. It is deprecated in 6.1. Per JVM CountStatistic All Max
ObjectMovedCount jvmRuntimeModule.numObjectsMoved
This counter is deprecated in 6.1.
Number of objects in the heap.
This counter is not available unless the -XrunpmiJvmpiProfiler option is set when starting the JVM.
From 4.0 to 6.0.x. It is deprecated in 6.1. Per JVM CountStatistic All Max
ObjectFreedCount jvmRuntimeModule.numObjectsFreed
This counter is deprecated in 6.1.
Number of objects freed in the heap.
This counter is not available unless the -XrunpmiJvmpiProfiler option is set when starting the JVM.
From 4.0 to 6.0.x. It is deprecated in 6.1. Per JVM CountStatistic All Max

The statistics that are gathered through the JVM Tool Interface (JVMTI) is different between the JVM provided by IBM and the Sun HotSpot-based JVM, including Sun HotSpot JVM on Solaris and HP’s JVM for HP-UX.

Name Key Description Granularity Type Level Overhead
FreeMemory jvmRuntimeModule.freeMemory Free memory in the JVM run time Per Java Virtual Machine (JVM) CountStatistic Extended Low
UsedMemory jvmRuntimeModule.usedMemory Used memory in the JVM run time Per JVM CountStatistic Basic Low
HeapSize jvmRuntimeModule.totalMemory Total memory in the JVM run time Per JVM BoundedRangeStatistic. The upperBound and lowerBound are not implemented for the Total memory counter. Basic High
UpTime jvmRuntimeModule.upTime Amount of time that the JVM is running Per JVM CountStatistic Basic Low
GCCount jvmRuntimeModule.numGcCalls Number of garbage collection calls.
This counter is not available unless the -XrunpmiJvmpiProfiler option is set when starting the JVM.
Per JVM CountStatistic All Max
GCIntervalTime jvmRuntimeModule.avgTimeBetweenGcCalls Average garbage collection value in seconds between two garbage collections.
This counter is not available unless the -XrunpmiJvmpiProfiler option is set when starting the JVM.
Per JVM TimeStatistic All Max
GCTime jvmRuntimeModule.avgGcDuration Average duration of a garbage collection.
This counter is not available unless the -XrunpmiJvmpiProfiler option is set when starting the JVM.
Per JVM TimeStatistic All Max
WaitsForLockCount jvmRuntimeModule.numWaitsForLock Number of times that a thread waits for a lock.
This counter is not available unless the -XrunpmiJvmpiProfiler option is set when starting the JVM.
Per JVM CountStatistic All Max
WaitForLockTime jvmRuntimeModule.avgTimeWaitForLock Average time that a thread waits for a lock.
This counter is not available unless the -XrunpmiJvmpiProfiler option is set when starting the JVM.
Per JVM TimeStatistic All Max
ObjectAllocateCount jvmRuntimeModule.numObjectsAllocated Number of objects that are allocated in the heap.
This counter is not available unless the -XrunpmiJvmpiProfiler option is set when starting the JVM.
Per JVM CountStatistic All Max
ObjectMovedCount jvmRuntimeModule.numObjectsMoved Number of objects in the heap.
This counter is not available unless the -XrunpmiJvmpiProfiler option is set when starting the JVM.
Per JVM CountStatistic All Max
ObjectFreedCount jvmRuntimeModule.numObjectsFreed Number of objects freed in the heap.
This counter is not available unless the -XrunpmiJvmpiProfiler option is set when starting the JVM.
Per JVM CountStatistic All Max
ThreadStartedCount jvmRuntimeModule.numThreadsStarted Number of threads started.
This counter is not available unless the -XrunpmiJvmpiProfiler option is set when starting the JVM.
Per JVM CountStatistic All Max
ThreadEndedCount jvmRuntimeModule.numThreadsDead Number of failed threads.
This counter is not available unless the -XrunpmiJvmpiProfiler option is set when starting the JVM.
Per JVM CountStatistic All Max

Name	Key	Description	Granularity	Type	Level	Overhead
CpuUsage	jvmRuntimeModule.cpuUsage	Average percent of CPU usage since the last query	Per JVM	CountStatistic	Basic	Low
FreeMemory	jvmRuntimeModule.freeMemory	Free memory in the JVM run time	Per JVM	CountStatistic	Extended	Low
UsedMemory	jvmRuntimeModule.usedMemory	Used memory in the JVM run time	Per JVM	CountStatistic	Basic	Low
HeapSize	jvmRuntimeModule.totalMemory	Total memory in the JVM run time	Per JVM	BoundedRangeStatistic. The upperBound and lowerBound are not implemented for the Total memory counter.	Basic	High
UpTime	jvmRuntimeModule.upTime	Amount of time that the JVM is running	Per JVM	CountStatistic	Basic	Low
GCCount	jvmRuntimeModule.numGcCalls	Number of garbage collection calls. This counter is not available unless the JVM profiler is enabled.	Per JVM	CountStatistic	All	Max
GCIntervalTime	jvmRuntimeModule.avgTimeBetweenGcCalls	Average garbage collection value in seconds between two garbage collections. This counter is not available unless the JVM profiler is enabled.	Per JVM	TimeStatistic	All	Max
GCTime	jvmRuntimeModule.avgGcDuration	Average duration of a garbage collection. This counter is not available unless the JVM profiler is enabled.	Per JVM	TimeStatistic	All	Max
WaitsForLockCount	jvmRuntimeModule.numWaitsForLock	Number of times that a thread waits for a lock. This counter is not available unless the JVM profiler is enabled.	Per JVM	CountStatistic	All	Max
WaitForLockTime	jvmRuntimeModule.avgTimeWaitForLock	Average time that a thread waits for a lock. This counter is not available unless the JVM profiler is enabled.	Per JVM	TimeStatistic	All	Max
ThreadStartedCount	jvmRuntimeModule.numThreadsStarted	Number of threads started. This counter is not available unless the JVM profiler is enabled.	Per JVM	CountStatistic	All	Max
ThreadEndedCount	jvmRuntimeModule.numThreadsDead	Number of failed threads. This counter is not available unless the JVM profiler is enabled.	Per JVM	CountStatistic	All	Max
ObjectAllocateCount	jvmRuntimeModule.numObjectsAllocated This counter is deprecated in 6.1.	Number of objects that are allocated in the heap. This counter is not available unless the -XrunpmiJvmpiProfiler option is set when starting the JVM.	From 4.0 to 6.0.x. It is deprecated in 6.1.	Per JVM	CountStatistic	All	Max
ObjectMovedCount	jvmRuntimeModule.numObjectsMoved This counter is deprecated in 6.1.	Number of objects in the heap. This counter is not available unless the -XrunpmiJvmpiProfiler option is set when starting the JVM.	From 4.0 to 6.0.x. It is deprecated in 6.1.	Per JVM	CountStatistic	All	Max
ObjectFreedCount	jvmRuntimeModule.numObjectsFreed This counter is deprecated in 6.1.	Number of objects freed in the heap. This counter is not available unless the -XrunpmiJvmpiProfiler option is set when starting the JVM.	From 4.0 to 6.0.x. It is deprecated in 6.1.	Per JVM	CountStatistic	All	Max

Name	Key	Description	Granularity	Type	Level	Overhead
FreeMemory	jvmRuntimeModule.freeMemory	Free memory in the JVM run time	Per Java Virtual Machine (JVM)	CountStatistic	Extended	Low
UsedMemory	jvmRuntimeModule.usedMemory	Used memory in the JVM run time	Per JVM	CountStatistic	Basic	Low
HeapSize	jvmRuntimeModule.totalMemory	Total memory in the JVM run time	Per JVM	BoundedRangeStatistic. The upperBound and lowerBound are not implemented for the Total memory counter.	Basic	High
UpTime	jvmRuntimeModule.upTime	Amount of time that the JVM is running	Per JVM	CountStatistic	Basic	Low
GCCount	jvmRuntimeModule.numGcCalls	Number of garbage collection calls. This counter is not available unless the -XrunpmiJvmpiProfiler option is set when starting the JVM.	Per JVM	CountStatistic	All	Max
GCIntervalTime	jvmRuntimeModule.avgTimeBetweenGcCalls	Average garbage collection value in seconds between two garbage collections. This counter is not available unless the -XrunpmiJvmpiProfiler option is set when starting the JVM.	Per JVM	TimeStatistic	All	Max
GCTime	jvmRuntimeModule.avgGcDuration	Average duration of a garbage collection. This counter is not available unless the -XrunpmiJvmpiProfiler option is set when starting the JVM.	Per JVM	TimeStatistic	All	Max
WaitsForLockCount	jvmRuntimeModule.numWaitsForLock	Number of times that a thread waits for a lock. This counter is not available unless the -XrunpmiJvmpiProfiler option is set when starting the JVM.	Per JVM	CountStatistic	All	Max
WaitForLockTime	jvmRuntimeModule.avgTimeWaitForLock	Average time that a thread waits for a lock. This counter is not available unless the -XrunpmiJvmpiProfiler option is set when starting the JVM.	Per JVM	TimeStatistic	All	Max
ObjectAllocateCount	jvmRuntimeModule.numObjectsAllocated	Number of objects that are allocated in the heap. This counter is not available unless the -XrunpmiJvmpiProfiler option is set when starting the JVM.	Per JVM	CountStatistic	All	Max
ObjectMovedCount	jvmRuntimeModule.numObjectsMoved	Number of objects in the heap. This counter is not available unless the -XrunpmiJvmpiProfiler option is set when starting the JVM.	Per JVM	CountStatistic	All	Max
ObjectFreedCount	jvmRuntimeModule.numObjectsFreed	Number of objects freed in the heap. This counter is not available unless the -XrunpmiJvmpiProfiler option is set when starting the JVM.	Per JVM	CountStatistic	All	Max
ThreadStartedCount	jvmRuntimeModule.numThreadsStarted	Number of threads started. This counter is not available unless the -XrunpmiJvmpiProfiler option is set when starting the JVM.	Per JVM	CountStatistic	All	Max
ThreadEndedCount	jvmRuntimeModule.numThreadsDead	Number of failed threads. This counter is not available unless the -XrunpmiJvmpiProfiler option is set when starting the JVM.	Per JVM	CountStatistic	All	Max