Jstack Profiler
Simple profiler that takes concatenation of jstack's output as input. It's useful, when you want to find out what's going on a production server that you can't stop or profile (with classic profiler).
How to compile
$ sbt assembly
It generates a big jar file in the target directory
How to use
First generate a full thread dump output every n seconds (60 sec in this example), append those thread dumps in a file (jstack.log in this example). Ctrl+C to terminate
$ while true ; do jstack PID >> jstack.log ; sleep 60 ; done
Then launch the analyze with:
$ cat jstack.log > java -jar target/jstack-profiler-assembly-0.1.jar
Here is an example of the output:
Runnable methods breakout
-------------------------
rank time name
0 82.50% java.lang.Thread.run(Thread.java:722)
1 80.00% sun.nio.ch.SelectorImpl.select(SelectorImpl.java:98)
2 11.79% org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42)
3 11.43% sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)
4 2.86% org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
5 2.50% sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:228)
6 1.79% org.springframework.jdbc.core.JdbcTemplate$3.doInPreparedStatement(JdbcTemplate.java:844)
7 0.71% java.net.SocketInputStream.socketRead0(Native Method)
8 0.36% com.google.gson.stream.JsonWriter.string(JsonWriter.java:535)
Blocked/Waiting methods breakout
--------------------------------
rank time name
0 41.96% com.example.service.run(Servie.java:123)
1 24.22% sun.misc.Unsafe.park(Native Method)
2 12.61% java.lang.Thread.run(Thread.java:722)
3 11.83% java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1043)
4 10.27% java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:226)
5 5.80% java.util.concurrent.LinkedBlockingDeque.takeFirst(LinkedBlockingDeque.java:440)
6 4.13% com.google.common.cache.LocalCache.get(LocalCache.java:3980)
7 2.68% com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:534)
8 1.56% java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:807)
9 1.45% java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
10 1.34% java.util.concurrent.SynchronousQueue$TransferStack.awaitFulfill(SynchronousQueue.java:424)
11 0.78% com.google.common.cache.LocalCache$Segment.waitForLoadingValue(LocalCache.java:2333)
12 0.11% java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:118)