WAS v8.5 > Reference > Administrator best practices

Thread pool counters

We can use the thread pool counters the Performance Monitoring Infrastructure (PMI) and Tivoli Performance Viewer (TPV) collect to monitor your thread pool activity.


Counter definitions

Name Key Description Granularity Type Level Overhead ID
CreateCount threadPoolModule.threadCreates The total number of threads created Per thread pool CountStatistic All Low 1
DestroyCount threadPoolModule.threadDestroys The total number of threads destroyed Per thread pool CountStatistic All Low 2
ActiveCount threadPoolModule.activeThreads The number of concurrently active threads

The ActiveCount value can include a count for a long-running thread used for asynchronous I/O. Under these circumstances, it is possible that even when there is no apparent activity on the thread pool, the ActiveCount value will never reach zero

Per thread pool BoundedRangeStatistic Extended High 3
PoolSize threadPoolModule.poolSize The average number of threads in pool Per thread pool BoundedRangeStatistic Basic High 4
PercentMaxed threadPoolModule.percentMaxed The average percent of the time that all threads are in use Per thread pool BoundedRangeStatistic All High 5
DeclaredthreadHungCount threadPoolModule.declaredThreadHung The number of threads declared hung Per thread pool CountStatistic All Max 6
ClearedThreadHangCount threadPoolModule.declaredThreadHangCleared The number of thread hangs cleared Per thread pool CountStatistic All Max 7
ConcurrentHungThreadCount threadPoolModule.concurrentlyHungThreads The number of concurrently hung threads Per thread pool BoundedRangeStatistic All Max 8
ActiveTime threadPoolModule.activeTime The average time in milliseconds the threads are in active state Per thread pool TimeStatistic All Max 9


Related


Monitoring overall system health


Reference:

PMI data organization


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