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Is there any command line tool for monitoring the heap size usage of Java in CentOS?

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up vote 3 down vote accepted

Use jps and jstack to learn more about Java processes. jstat can also be useful for Java statistics monitoring.

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jvmtop is a command-line tool which provides a live-view at several metrics, including heap.

Example output of the VM overview mode:

 JvmTop 0.3 alpha (expect bugs)  amd64  8 cpus, Linux 2.6.32-27, load avg 0.12
 http://code.google.com/p/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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why there is an error for process 11272? – akirekadu Apr 28 at 22:35
    
@akirekadu There are many reasons. The most common ones are incompatible JDKs between jvmtop and the target jvm or insufficient/denied permissions. See FAQ for details. – MRalwasser Apr 29 at 12:49

You probably want to analyse the memory usage.

GCView might help you visualize what the GC-log shows.

If you already enabled the gc-log you could just use tail -f on that log.

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cd /opt/www/java/jdk/bin/

# jmap -heap <JAVA_PID>
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