JPMP (Java's Poor Man's Profiler)

I recently came across PMP and found it surprisingly useful to troubleshoot and analyze live production systems, despite it being so ridiculously simple and naive. Unfortunately for me, I've had to deal with quite a bit of Java lately. So here we go, JPMP:

$ cat jpmp
#!/bin/bash
pid=$1
nsamples=$2
sleeptime=$3

for x in $(seq 1 $nsamples)
  do
    jstack $pid
    sleep $sleeptime
  done | \
awk 'BEGIN { s = "" }
/^"/ { if (s) print s; s = "" }
/^ at / { sub(/\([^)]*\)?$/, "", $2); sub(/^java/, "j", $2);
               if (s) s = s "," $2; else s = $2 }
END { if(s) print s }' | \
sort | uniq -c | sort -rnk1

Output:

$ jpmp 28881 5 0
    120 sun.misc.Unsafe.park,j.util.concurrent.locks.LockSupport.park,j.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await,j.util.concurrent.LinkedBlockingQueue.take,j.util.concurrent.ThreadPoolExecutor.getTask,j.util.concurrent.ThreadPoolExecutor$Worker.run,j.lang.Thread.run
     15 sun.nio.ch.EPollArrayWrapper.epollWait,sun.nio.ch.EPollArrayWrapper.poll,sun.nio.ch.EPollSelectorImpl.doSelect,sun.nio.ch.SelectorImpl.lockAndDoSelect,sun.nio.ch.SelectorImpl.select,org.simpleframework.transport.reactor.ActionDistributor.distribute,org.simpleframework.transport.reactor.ActionDistributor.execute,org.simpleframework.transport.reactor.ActionDistributor.run,j.lang.Thread.run
      5 sun.nio.ch.EPollArrayWrapper.epollWait,sun.nio.ch.EPollArrayWrapper.poll,sun.nio.ch.EPollSelectorImpl.doSelect,sun.nio.ch.SelectorImpl.lockAndDoSelect,sun.nio.ch.SelectorImpl.select,org.apache.zookeeper.ClientCnxn$SendThread.run
      5 sun.misc.Unsafe.park,j.util.concurrent.locks.LockSupport.park,j.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await,j.util.concurrent.LinkedBlockingQueue.take,org.apache.zookeeper.ClientCnxn$EventThread.run
      5 sun.misc.Unsafe.park,j.util.concurrent.locks.LockSupport.park,j.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await,j.util.concurrent.DelayQueue.take,org.simpleframework.util.lease.LeaseCleaner.clean,org.simpleframework.util.lease.LeaseCleaner.run,j.lang.Thread.run
      5 j.lang.Thread.sleep,org.simpleframework.util.buffer.FileManager.run,j.lang.Thread.run
      5 j.lang.Object.wait,j.lang.ref.ReferenceQueue.remove,j.lang.ref.ReferenceQueue.remove,j.lang.ref.Finalizer$FinalizerThread.run
      5 j.lang.Object.wait,j.lang.Object.wait,j.lang.ref.Reference$ReferenceHandler.run