How to monitor JBoss CPU usage ?

Written by Mark S.

JBoss tip of the day

If you want to inspect jBoss Thread CPU's usage you have a shortcut from the jmx-console.

point at the Mbean ServerInfo under the domain jboss.system.

This is a shortcut if you're running your server on localhost:
http://localhost:8080/jmx-console/HtmlAdaptor?action=inspectMBean&name=jboss.system%3Atype%3DServerInfo

now invoke the operation listThreadCpuUtilization()

Thread Name	CPU (milliseconds)
http-127.0.0.1-8080-1	609
ScannerThread	500
DestroyJavaVM	125
DefaultQuartzScheduler_QuartzSchedulerThread	78
ContainerBackgroundProcessor[StandardEngine[jboss.web]]	15
DefaultQuartzScheduler_Worker-1	15
DefaultQuartzScheduler_Worker-5	15
Thread-4	15

Here you can see which threads are pumping the cpu - have a look, besides the threads dedicated to the web applications (running on port 8080) you are using quite a lof of cpu for the ScannerThread which is responsible of period based scanning for the Deployment of applications.
Sure you need to enable Deployment Scanning ? in production enviroment you had better disabling it: have a look here at this tip:

http://www.mastertheboss.com/en/jboss-howto/38-jboss-recipe/68-configure-jboss-disable-hot-deployment-.html

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