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.

Except for the counters that are used for total, used, and free heap size, you can find the counters by using the Java virtual machine Profiler Interface (JVMPI). To use JVMPI, you must turn on the monitoring by setting the -XrunpmiJvmpiProfiler command line. See Enabling the Java virtual machine profiler data for more information.

Counter definitions

Name Key Description Granularity Type Level Overhead
FreeMemory jvmRuntimeModule.freeMemory The free memory in the JVM run time Per Java Virtual Machine (JVM) CountStatistic Extended Low
UsedMemory jvmRuntimeModule.usedMemory The used memory in the JVM run time Per JVM CountStatistic Basic Low
HeapSize jvmRuntimeModule.totalMemory The total memory in the JVM run time Per JVM BoundedRangeStatistic. The upperBound and lower bound are not implemented for the Total memory counter. Basic High
UpTime jvmRuntimeModule.upTime The amount of time that the JVM is running Per JVM CountStatistic Basic Low



Related tasks
Enabling the Java virtual machine profiler data
Related reference
PMI data organization
Reference topic    

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