Why we need JTOP plugin ?
With JConsole , we can detect that there are high CPU load. But it does not tell what are the possible root causes for this CPU load. So , with JTOP plugin , it lists all the top level CPU usages in the process.
How to use JTOP plugin with JConsole ?
When starting the JConsole, you need to give the path to the JTop plugin.
Eg: My JavaHome is : /opt/software/jdk1.6.0_29
$jconsole -pluginpath /opt/software/jdk1.6.0_29/demo/management/JTop/JTop.jar
General way to start the JConsole with JTop is described in Evanthika's Blog.
Why i wanted to use JTOP?
When i was testing my server, i experienced a high CPU usage with that server. So i wanted to isolate the issue i have in that server. So i started the JConsole with JTop plugin and my out put was as in following image.
With that i could find that , CPU is highly consumed by these threads. So when i looked in to the thread with "Thread" tab in JConsole, i could identify the root cause for the problem.
So, to identify the root cause of the CPU overloading issue, JTOP plugin helped me a lot.