Use thread pool counters to monitor thread pool activity

Thread pool counters

Use the thread pool counters that the Performance Monitoring Infrastructure (PMI) and Tivoli Performance Viewer (TPV) collect to monitor the 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
ActiveTime will be updated when the hung threads are cleared (The threads have completed their processing).
Per thread pool TimeStatistic All Max 9

Monitor overall system health
PMI data organization

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 ActiveTime will be updated when the hung threads are cleared (The threads have completed their processing).	Per thread pool	TimeStatistic	All	Max	9