jvmtop is a lightweight console application to monitor all accessible, running jvms on a machine.
In a top-like manner, it displays JVM internal metrics (e.g. memory information) of running java processes.

Jvmtop does also include a CPU console profiler.

It's tested with different releases of Oracle JDK, IBM JDK and OpenJDK on Linux, Solaris, FreeBSD and Windows hosts.
Jvmtop requires a JDK - a JRE will not suffice.

Please note that it's currently in an alpha state -
if you experience an issue or need further help, please let us know.

Jvmtop is open-source. Checkout the source code. Patches are very welcome!

Also have a look at the documentation or at a captured live-example.

 JvmTop 0.8.0 alpha   amd64  8 cpus, Linux 2.6.32-27, load avg 0.12
 https://github.com/patric-r/jvmtop

  PID MAIN-CLASS      HPCUR HPMAX NHCUR NHMAX    CPU     GC    VM USERNAME   #T DL
 3370 rapperSimpleApp  165m  455m  109m  176m  0.12%  0.00% S6U37 web        21
11272 ver.resin.Resin [ERROR: Could not attach to VM]
27338 WatchdogManager   11m   28m   23m  130m  0.00%  0.00% S6U37 web        31
19187 m.jvmtop.JvmTop   20m 3544m   13m  130m  0.93%  0.47% S6U37 web        20
16733 artup.Bootstrap  159m  455m  166m  304m  0.12%  0.00% S6U37 web        46

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Installation

Click on the releases tab, download the most recent tar.gz archive. Extract it, ensure that the `JAVA_HOME` environment variable points to a valid JDK and run `./jvmtop.sh`.

Further information can be found in the [INSTALL file](https://github.com/patric-r/jvmtop/blob/master/INSTALL)

08/14/2013 jvmtop 0.8.0 released

Changes:

• improved attach compatibility for all IBM jvms
  
• fixed wrong CPU/GC values for IBM J9 jvms
  
• in case of unsupported heap size metric retrieval, n/a will be displayed instead of 0m
  
• improved argument parsing, support for short-options, added help (pass --help), see issue #28 (now using the great jopt-simple library)
  
• when passing the --once option, terminal will not be cleared anymore (see issue #27)
  
• improved shell script for guessing the path if a JAVA_HOME environment variable is not present (thanks to Markus Kolb)

Full changelog

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In VM detail mode it shows you the top CPU-consuming threads, beside detailed metrics:

 JvmTop 0.8.0 alpha   amd64,  4 cpus, Linux 2.6.18-34
 https://github.com/patric-r/jvmtop

 PID 3539: org.apache.catalina.startup.Bootstrap
 ARGS: start
 VMARGS: -Djava.util.logging.config.file=/home/webserver/apache-tomcat-5.5[...]
 VM: Sun Microsystems Inc. Java HotSpot(TM) 64-Bit Server VM 1.6.0_25
 UP: 869:33m #THR: 106  #THRPEAK: 143  #THRCREATED: 128020 USER: webserver
 CPU:  4.55% GC:  3.25% HEAP: 137m / 227m NONHEAP:  75m / 304m
  TID   NAME                                    STATE    CPU  TOTALCPU BLOCKEDBY
     25 http-8080-Processor13                RUNNABLE  4.55%     1.60%
 128022 RMI TCP Connection(18)-10.101.       RUNNABLE  1.82%     0.02%
  36578 http-8080-Processor164               RUNNABLE  0.91%     2.35%
  36453 http-8080-Processor94                RUNNABLE  0.91%     1.52%
     27 http-8080-Processor15                RUNNABLE  0.91%     1.81%
     14 http-8080-Processor2                 RUNNABLE  0.91%     3.17%
 128026 JMX server connection timeout   TIMED_WAITING  0.00%     0.00%

Pull requests / bug reports are always welcome.