Java virtual machine counters
Use the 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
| 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
| 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
| 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 |
Deprecated feature: This counter only applies to Versions
4.0 - 6.0.x. It was deprecated in v6.1.depfeat
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..