topic Re: java occupies more memory in Operating System - HP-UX

java occupies more memory

Soundararajan — Wed, 12 Feb 2003 08:09:26 GMT

Hi All,

I recently installed HP-UX 11.0 (Sep 2002 release) on this system (J6700) along with QPK bundle (that came with the CD) and the latest patches required to run java applications (1.3.1_02). The java processes running on this system unusally occupies huge chunk of memory (although the RES size varies between 30-60MB). The moment (say I start a servlet engine) a java process is started, I can see in top, that it occupies more than 200MB. This does not happen in any of our other HP machines. I have asked my developers to use -Xmx option with java to define the max. heap size, but not sure if this will solve the problem.

Although, the processes are occupying huge memory, it does not stop the application, although sometimes we get OutOfMemory exception. I am attaching the top output (txt file)

Any suggestions?

Thanks,
Soundar

Re: java occupies more memory

Steve Steel — Wed, 12 Feb 2003 08:57:05 GMT

Hi

1)look at kernel tuning.

This may be related to max_threads_proc limitation. to 6This variable is set very low by default.. You will find further information in the HP-UX kernel parameter configuration for Java??? support in the Java Programmer's Guide.

2)You have a fairly old java. get a newer oner.

see www.hp.com/go/java

3)try hptools available to help tuning at above website

steve Steel

Re: java occupies more memory

Steve Steel — Wed, 12 Feb 2003 08:58:57 GMT

Hi Again

Check patch levels as well since this can be a memory leak.

steve Steel

Re: java occupies more memory

U.SivaKumar_2 — Wed, 12 Feb 2003 09:03:41 GMT

Hi,

Decrease the dbc_max_pct kernel paramter to 30%. This will free up more memory for applications.

regards,

U.SivaKumar