Open Source Java Profilers

Question

What can you guys recommend to use with Java?

Only requirement is it should be open source, or has not too expensive academic licence .

Answer 1

The VisualVM which comes with jdk6 has a basic profiler inside it. VisualVM is provided with the jdk, so if you have the jdk6 installed, you likely have it installed as well.

https://visualvm.github.io/

Answer 2

The open-source tool jvmtop does include a basic console profiler. Example output:

 JvmTop 0.7.0 alpha - 15:16:34,  amd64,  8 cpus, Linux 2.6.32-27, load avg 0.41
 http://code.google.com/p/jvmtop

 Profiling PID 24015: org.apache.catalina.startup.Bootstrap

  36.16% (    57.57s) hudson.model.AbstractBuild.calcChangeSet()
  30.36% (    48.33s) hudson.scm.SubversionChangeLogParser.parse()
   7.14% (    11.37s) org.kohsuke.stapler.jelly.JellyClassTearOff.parseScript()
   6.25% (     9.95s) net.sf.json.JSONObject.write()
   3.13% (     4.98s) ....kohsuke.stapler.jelly.CustomTagLibrary.loadJellyScri()

Answer 3

JVM Monitor is a Java profiler integrated with Eclipse to monitor CPU, threads and memory usage of Java applications.

If further deep analysis is needed, you may use other tools (e.g. TPTP, Memory Analyzer) as a next step.

Answer 4

Eclipse TPTP

Here's an article about Java Application Profiling using TPTP and here's a tutorial Profiling J2SE 5.0 based applications using Eclipse TPTP.

Answer 5

Java has a basic built in profiler called HProf. I find it useful to compare the results it provides with results from more fully features profilers.