Our jenkins server seems to have a slow memory leak (runs out after about 5
days). We noticed this after upgrading from 1.596 to 1.642.1. I already
increased memory space for java ( -XX:MaxPermSize=512m -Xmx512m).
I have a heap dump and histogram, but I am not sure how to proceed. The
histogram starts like this
num #instances #bytes class name
----------------------------------------------
1: 978285 187967360 [C
2: 42467 113726864 [B
3: 1259878 40316096 java.lang.StackTraceElement
4: 968080 23233920 java.lang.String
5: 252385 19069600 [Ljava.lang.Object;
6: 116007 12968192 [I
7: 82985 6636360 [S
8: 204713 6550816
java.util.concurrent.ConcurrentHashMap$Node
9: 91323 5844672 java.net.URL
10: 56639 5683352 [Ljava.lang.StackTraceElement;
I don't know what [C or [B is. Perhaps a corruption? Also, what is going
on with StackTraceElement?
We see a lot of these in our log
WARNING: Executor #0 for XXX-build1 : executing XXX-treemake #4203
termination trace
hudson.model.Computer$TerminationRequest: Termination requested at Wed Mar
23 15:17:25 PDT 2016 by Thread[jenkins.util.Timer [#2],5,main] [id=27]
at hudson.model.Computer.recordTermination(Computer.java:219)
at hudson.model.Computer.disconnect(Computer.java:481)
at hudson.slaves.SlaveComputer.disconnect(SlaveComputer.java:611)
at
hudson.slaves.RetentionStrategy$Demand.check(RetentionStrategy.java:270)
at
hudson.slaves.RetentionStrategy$Demand.check(RetentionStrategy.java:178)
at
hudson.slaves.ComputerRetentionWork$1.run(ComputerRetentionWork.java:71)
at hudson.model.Queue._withLock(Queue.java:1346)
at hudson.model.Queue.withLock(Queue.java:1229)
at
hudson.slaves.ComputerRetentionWork.doRun(ComputerRetentionWork.java:62)
at hudson.triggers.SafeTimerTask.run(SafeTimerTask.java:50)
at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
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