Resident Memory

[samanth9]

Hi,

We are running a Application on JBoss 5.0.1 with -Xms 3072 and Xmx 3072. When i check the memory utilization using Top command. The Resident Memory for that particular process in 9G.

I didn't see any OutofMemory Execeptions or errors in the logs. Also i took the HeapDump which is 2.4G and I didn't find any leaks.

So why the process is taking such a huge memory? Can some one help me on this?

Thanks in Advance

Sam

[peterj]

There is more to the memory footprint of a java application thatn the heap size. See this:

http://www.coderanch.com/t/111262/Linux-UNIX/read-memory-usage-process-running#560894

[samanth9]

Thanks Peter for a quick response.

I understand java process takes more than the java heap which we provided. But 9G is huge variance.

Couple of month back it was taking 5G(which is OK). But now it reached to 9G.

Can you please recommond any tool. So that i can see what exactly eating all the memory.

Thank You So Much

Sam

[wdfink]

Is the memory increasing during runtime?

How do you size the PermGen and how many threads are running? Maybe this will give a hint.

Also I've seen JVM or OS related bugs in such cases. You should check for OS patches and the latest JVM version.

[samanth9]

Thanks Wolf.

Yes its increasing on runtime. Once i do a fresh restart, the 1st week it reaches to 3-4G then after couple of weeks its going to 9G.

PermGen is 512mb and nearly 350 live threads.

I will try with latest OS patches and get back to you guys.

Thanks Again.

[wdfink]

Also you should check whether to use a newer JVM version.