hi.
My JIRA instalation eats alot of cpu time during "not so high load" at night for example.
thread dump shows that most of the time that threads are on
"C1 CompilerThread3" #8 daemon prio=9 os_prio=0 tid=0x00007f534400a800 nid=0x56d3 runnable [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"C2 CompilerThread2" #7 daemon prio=9 os_prio=0 tid=0x00007f5344008800 nid=0x56d2 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"C2 CompilerThread1" #6 daemon prio=9 os_prio=0 tid=0x00007f5344006800 nid=0x56d1 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"C2 CompilerThread0" #5 daemon prio=9 os_prio=0 tid=0x0000000001eb3000 nid=0x56d0 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
any ideas how to debug it?
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答案：
Matheus Fernandes ATLASSIAN TEAM Jul 27, 2015
Hi, Aleksey,
May I know if can see the following on the JIRA logs:
Java HotSpot(TM) 64-Bit Server VM warning: CodeCache is full. Compiler has been disabled. I believe this may be related to the CompilerThreads using so much CPU. This behavior is fully explained on this blog post:
Matheus Fernandes ATLASSIAN TEAM Jul 27, 2015 Hi, Aleksey, May I know if can see the following on the JIRA logs: Java HotSpot(TM) 64-Bit Server VM warning: CodeCache is full. Compiler has been disabled. I believe this may be related to the CompilerThreads using so much CPU. This behavior is fully explained on this blog post:
We don’t have any statistics as to the impact of this on long running performance; the impression that I have is that CPU utilisation & request service time would increase over long running VMs for code that could have been optimised.
For a system that is over-committed on CPU resources the application throughput could decrease noticeably.
To try to mitigate that, could you try adding the following parameters to the JIRA startup and restart JIRA:
-XX:ReservedCodeCacheSize=384m -XX:+UseCodeCacheFlushing
Reference: https://confluence.atlassian.com/x/6xS_Eg I hope this helps!
