topic Monitoring and controlling memory usage of Java instances in Operating System - HP-UX

Monitoring and controlling memory usage of Java instances

kcw — Wed, 30 Apr 2008 06:56:49 GMT

Hi everyone,
Does anyone know that how can I monitor a number of Java instances and see if they are consuming too much memory resources?? Also, can I control the memory usage of them?? Many thanks

Best Regards
KCW

Re: Monitoring and controlling memory usage of Java instances

Safarali — Wed, 30 Apr 2008 07:15:44 GMT

ps -eaf | grep java | wc -l

Regards

Safar

Re: Monitoring and controlling memory usage of Java instances

Jeeshan — Wed, 30 Apr 2008 07:21:09 GMT

export UNIX95=1;ps -ef -o comm,pcpu,vsz,args | grep java

it will show the cpu % and memory in KB size.

Re: Monitoring and controlling memory usage of Java instances

Dennis Handly — Wed, 30 Apr 2008 07:44:26 GMT

Have you looked into HPjmeter and the various java heap and garbage collection options?
http://www.hp.com/go/java

Re: Monitoring and controlling memory usage of Java instances

Yogeeraj_1 — Wed, 30 Apr 2008 08:03:42 GMT

hi KCW,

>Also, can I control the memory usage of them??

For this you will have to define appropriate parameters at the application level itself. What type of application are you running?

revert!
kind regards
yogeeraj

Re: Monitoring and controlling memory usage of Java instances

Steven E. Protter — Wed, 30 Apr 2008 08:20:28 GMT

Shalom,

http://www.hpux.ws/?p=8

Ultimately you will identify processes and this will lead back to the java code.

Nice to know however who the offending processes are.

SEP

Re: Monitoring and controlling memory usage of Java instances

kcw — Wed, 30 Apr 2008 09:00:43 GMT

Hi Yogeeraj,

Thanks for your help, it is running J2EE, details as below:
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2.10-060112-14:28)
Java HotSpot(TM) Server VM (build 1.4.2 1.4.2.10-060112-19:42-IA64N IA64, mixed mode)

Best Regards
KCW

Re: Monitoring and controlling memory usage of Java instances

kcw — Wed, 30 Apr 2008 09:09:39 GMT

Dear all,
Attached please find the glance report of the server, again, thank you very much for your great help!!

Best Regards
KCW

Re: Monitoring and controlling memory usage of Java instances

Yogeeraj_1 — Wed, 30 Apr 2008 10:29:59 GMT

hi KCW,

For java applications, we can control the heap size at the command Line level.

Available switches are:
-Xms64m -Xmx512m
-Xms is for initial heap size
-Xmx is for maximum heap size

NB. The default for ms and mx is 64 MB (64m).

hope this helps!
kind regards,
yogeeraj

Re: Monitoring and controlling memory usage of Java instances

kcw — Fri, 02 May 2008 06:38:55 GMT

Dear all and Yogeeraj,
Do you think the memory usage is too high (please kindly see the attachment) for the machine?? As it always indicate that 99% usage of memory. Thanks

Best Regards
Sunny Lo

Re: Monitoring and controlling memory usage of Java instances

Yogeeraj_1 — Fri, 02 May 2008 06:53:12 GMT

Hi Sunny Lo,

with the limited amount of information available about your system, it is quite difficult to get the global picture here.

Indeed some of the java processes are using an 'abnormal' amount of memory compared to other java processes on the same system.

Did you look into: HPjmeter ?

Since you have glance, you could just drill-into the top processes and check the resources etc...

What type of application is it? Oracle? If yes, why don't you log a service request so that the metalink analyst look into the issue more deeply.

kind regards
yogeeraj