On 16/10/2012 17:52, Shanti Suresh wrote: > Greetings. > > I have some questions on finding the number of active threads in Tomcat. > (1) On our QA system, I notice that the currenthreadsBusy MBean is > either zero or one for the 8443 and 8080 connectors.
ThreadCount != currentThreadsBusy One is the count of threads, one is the threads that are doing work. > Why then is ThreadCount = 93 when there is not much going on on QA? Because you've previously done enough work for Tomcat to maintain 93 threads. > (2) When I want to graph the thread activity in Tomcat (the thread > Pool usage), which is a better counter to look at - currentThreadsBusy > or "ThreadCount"? Depends what you want know. > It seems like "ThreadCount" is what JConsole displays as "Live Threads". > (3) Why is TotalStartedThreadCount: 264? Is that a cumulative total > since Tomcat was restarted? Yes. p > --------------Thread-related MBean snippet:--------- > > Name: Catalina:type=ThreadPool,name="http-apr-8443" > currentThreadsBusy: 1 > ... > > Name: Catalina:type=ThreadPool,name="http-apr-8080" > currentThreadsBusy: 0 > ... > > Name: java.lang:type=Threading > DaemonThreadCount: 85 > PeakThreadCount: 99 > AllThreadIds: Array[long] of length 93 > 135 > 119 > 118 > 117 > ... > > CurrentThreadCpuTime: 4600000000 > CurrentThreadUserTime: 4020000000 > ThreadCount: 93 > TotalStartedThreadCount: 264 > ThreadCpuTimeSupported: true > ... > ---------------end of snippet------------------------ > > Thanks! > > -Shanti > -- [key:62590808]
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