System counters

System counters

You can use the system counters that the Performance Monitoring Infrastructure (PMI) and Tivoli Performance Viewer (TPV) collect to monitor how efficiently your system a specific machine (node) is running.
Counters for this category contain information for a machine (node).

Counter definitions

Name Key Description Granularity Type Level Overhead
CPUUsageSinceLastMeasurement systemModule.cpuUtilization The average system CPU utilization taken over the time interval since the last reading. Because the first call is required to perform initialization, a value such as 0, which is not valid, will be returned. All subsequent calls return the expected value. On SMP machines, the value returned is the utilization averaged over all CPUs. Per node CountStatistic Basic Low
FreeMemory systemModule.freeMemory The amount of real free memory available on the system. Real memory that is not allocated is only a lower bound on available real memory, since many operating systems take some of the otherwise unallocated memory and use it for additional I/O buffering. The exact amount of buffer memory which can be freed up is dependent on both the platform and the application(s) running on it. Per node CountStatistic All Low
CPUUsageSinceServerStarted systemModule.avgCpuUtilization The average percent CPU Usage that is busy after the server is started. Per node TimeStatistic Extended Medium

Related Reference

PMI data organization

Reference topic

Name	Key	Description	Granularity	Type	Level	Overhead
CPUUsageSinceLastMeasurement	systemModule.cpuUtilization	The average system CPU utilization taken over the time interval since the last reading. Because the first call is required to perform initialization, a value such as 0, which is not valid, will be returned. All subsequent calls return the expected value. On SMP machines, the value returned is the utilization averaged over all CPUs.	Per node	CountStatistic	Basic	Low
FreeMemory	systemModule.freeMemory	The amount of real free memory available on the system. Real memory that is not allocated is only a lower bound on available real memory, since many operating systems take some of the otherwise unallocated memory and use it for additional I/O buffering. The exact amount of buffer memory which can be freed up is dependent on both the platform and the application(s) running on it.	Per node	CountStatistic	All	Low
CPUUsageSinceServerStarted	systemModule.avgCpuUtilization	The average percent CPU Usage that is busy after the server is started.	Per node	TimeStatistic	Extended	Medium