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I am currently using jconsole to monitor performance metrics of my Java application and would like to script this data acquisition.
Is there a way to retrieve these VM metrics (heap memory usage, thread count, CPU usage etc.) to STDOUT?
The data in top -p PID -b -n 1 doesn't quite cut it.
Thanks
935
In summary graph you can export sub areas by right clicking and selecting 'export' to csv.
The jconsole executable can be found in JDK_HOME/bin, where JDK_HOME is the directory in which the Java Development Kit (JDK) is installed. If this directory is in your system path, you can start JConsole by simply typing jconsole in a command (shell) prompt.
To connect JConsole to server process, in the Remote Process section, specify the URL service:jmx:rmi:///jndi/rmi://localhost:2047/fmq and credentials pertaining to the server. Default user name and password are admin and passwd respectively.
jconsole just provides a wrapper around the JMX MBeans that are in the platform MBeanServer.
You can write a program to connect to your VM using the Attach API which would then query the MBeans.
Or you can expose the platform MBeanServer over RMI and query the MBeans that way.
See the java.lang.management package for more info
101
Maybe jvmtop is worth a look.
It's a command-line tool which provides a live-view for several metrics.
JvmTop 0.4.1 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 If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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