jvm - jmap -permstat takes long time and hangs -


we started seeing 'java.lang.outofmemoryerror: permgen space'. in order findout held in perm space, tried running

'/usr/j2sdk1.6.0_13/bin/jmap -permstat 20476 -j-mx1280m > /tmp/permstats20476.txt &'

this command taking long time ..... in between gave below exception:

finding class loader instances ..252829 intern strings occupying 30781792 bytes. finding object size using printezis bits , skipping over... finding object size using printezis bits , skipping over... finding object size using printezis bits , skipping over... finding object size using printezis bits , skipping over...

done. computing per loader stat ..done. please wait.. computing liveness...................exception in thread "thread-1" java.lang.outofmemoryerror: gc overhead limit exceeded @ sun.jvm.hotspot.debugger.linux.linuxdebuggerlocal.readbytesfromprocess0(native method) @ sun.jvm.hotspot.debugger.linux.linuxdebuggerlocal.access$1000(linuxdebuggerlocal.java:51) @ sun.jvm.hotspot.debugger.linux.linuxdebuggerlocal$1readbytesfromprocesstask.doit(linuxdebuggerlocal.java:558) @ sun.jvm.hotspot.debugger.linux.linuxdebuggerlocal$linuxdebuggerlocalworkerthread.run(linuxdebuggerlocal.java:127)

but not completing ...

[svcmig2@app430 ~]$ uname -a linux app430... 2.6.18-194.el5 #1 smp tue mar 16 21:52:39 edt 2010 x86_64 x86_64 x86_64 gnu/linux

is there other alternates jmap ? perm stats fast

is there other alternates jmap ? perm stats fast

you can make 1 yourself! easy aid of serviceability agent.

here example case:

import sun.jvm.hotspot.memory.*; import sun.jvm.hotspot.oops.*; import sun.jvm.hotspot.runtime.*; import sun.jvm.hotspot.tools.tool;  public class permtool extends tool {      @override     public void run() {         // show permgen object histogram         objecthistogram histo = new objecthistogram();         vm.getvm().getobjectheap().iterateperm(histo);         histo.print();          // list classes in permgen classloaders         vm.getvm().getobjectheap().iterateperm(new defaultheapvisitor() {             @override             public boolean doobj(oop obj) {                 if (obj instanceof instanceklass) {                     obj.printvalue();                     oop loader = ((instanceklass) obj).getclassloader();                     if (loader == null) {                         system.out.println(" -- loaded bootstrap classloader");                     } else {                         system.out.print(" -- loaded ");                         loader.printvalue();                         system.out.println();                     }                 }                 return false;             }         });     }      public static void main(string[] args) {         new permtool().start(args);     } }

just compile , run using same jdk target process.
make sure jdk/lib/sa-jdi.jar on classpath.


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