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 console CPU and Memory 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.