Java virtual machine counters
You can use the Java™ virtual machine (JVM) counters that the Performance Monitoring Infrastructure (PMI) and Tivoli® Performance Viewer (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.
Counter definitions
Name | Key | Description | Granularity | Type | Level | Overhead | ID |
---|---|---|---|---|---|---|---|
FreeMemory | jvmRuntimeModule.freeMemory | The free memory in the JVM run time | Per JVM | CountStatistic | Extended | Low | 2 |
HeapSize | jvmRuntimeModule.totalMemory | The total memory in the JVM run time | Per JVM | BoundedRangeStatistic. The upperBound and lowerBound are not implemented for the Total memory counter. | Basic | High | 1 |
ProcessCpuUsage | jvmRuntimeModule.cpuUsage | The CPU Usage (in percent) of the Java virtual machine. | Per JVM | CountStatistic | Basic | Low | 5 |
UpTime | jvmRuntimeModule.upTime | The amount of time that the JVM is running | Per JVM | CountStatistic | Basic | Low | 4 |
UsedMemory | jvmRuntimeModule.usedMemory | The used memory in the JVM run time | Per JVM | CountStatistic | Basic | Low | 3 |
GCcount | jvmRuntimeModule.numGcCalls | The number of garbage collection calls. This counter is not available unless the JVM profiler is enabled. | Per JVM | CountStatistic | All | Max | 11 |
GCIntervalTime | jvmRuntimeModule.avgTimeBetweenGcCalls | The average garbage collection value in milliseconds between two garbage collections. This counter is not available unless the JVM profiler is enabled. | Per JVM | TimeStatistic | All | Max | 12 |
GCTime | jvmRuntimeModule.avgGcDuration | The average time duration in milliseconds of a garbage collection. This counter is not available unless the JVM profiler is enabled. | Per JVM | TimeStatistic | All | Max | 13 |
WaitsForLockCount | jvmRuntimeModule.numWaitsForLock | The 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 | 19 |
WaitForLockTime | jvmRuntimeModule.avgTimeWaitForLock | The 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 | 20 |
ThreadStartedCount | jvmRuntimeModule.numThreadsStarted | The number of threads started. This counter is not available unless the JVM profiler is enabled. | Per JVM | CountStatistic | All | Max | 17 |
ThreadEndedCount | jvmRuntimeModule.numThreadsDead | The number of failed threads. This counter is not available unless the JVM profiler is enabled. | Per JVM | CountStatistic | All | Max | 18 |
ObjectAllocateCount | jvmRuntimeModule.numObjectsAllocated Deprecated feature: This counter only applies to Versions
4.0 - 6.0.x. It was deprecated in Version 6.1.
|
The 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 | 14 |
ObjectMovedCount | jvmRuntimeModule.numObjectsMoved Deprecated feature: This counter only applies to Versions
4.0 - 6.0.x. It was deprecated in Version 6.1.
|
The 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 | 16 |
ObjectFreedCount | jvmRuntimeModule.numObjectsFreed Deprecated feature: This counter only applies to Versions
4.0 - 6.0.x. It was deprecated in Version 6.1.
|
The 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 | 15 |
Avoid trouble: The statistics that are gathered
through the JVM Tool Interface (JVMTI) are different for the JVM provided
by IBM® than the statistics that are gathered are
for the Sun HotSpot-based JVM, including Sun HotSpot JVM on Solaris
and the JVM provided by Hewlett-Packard for HP-UX.