The memory region 'PS Old Gen' is at 95.17% usage. (789 Views)
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Trusted Contributor
Nestor Herrera
Posts: 146
Registered: ‎06-13-2011
Message 1 of 3 (789 Views)

The memory region 'PS Old Gen' is at 95.17% usage.

Hello Team

I presented a NNMi alert:

The memory region 'PS Old gene' is at 95.17% usage.

the increase in the memory in the file and parameter ‑Xmx already registered, but the problem persists occasionally.

Any ideas?

 

Best regards

Valued Contributor
pafreire
Posts: 140
Registered: ‎01-10-2011
Message 2 of 3 (746 Views)

Re: The memory region 'PS Old Gen' is at 95.17% usage.

Hello Nestor,

 

Beyond the obvious suggestion to improve physical memory, I did some changes in NNMi 9.1x to optimize memory usage that could help you:

 

1. Change the relation between old and young gen:

 

-XX:NewRatio=1

  

2. Set the same value to -Xms and -Xmx to minimize the overhead to allocate memory. For instance:

 

-Xms10g

-Xmx10g

 

3. Set the -Xms and -Xmx to use the maximum memory available excluding 1-2GB for OS and 2-4GB for DB. Only with some time of monitoring is possible to define the best configuration for your system.

 

This recomendations are based in Oracle Java Documentation and empirical tests.

 

To monitoring JVM memory utilization, you can use jconsole tool. Please see the link below for more details: 

 

http://docs.oracle.com/javase/7/docs/technotes/guides/management/jconsole.html

 

 

Hope this helps,

 

Paulo

“The greatest challenge to any thinker is stating the problem in a way that will allow a solution.”
Bertrand Russell
Trusted Contributor
msharma
Posts: 128
Registered: ‎07-18-2011
Message 3 of 3 (723 Views)

Re: The memory region 'PS Old Gen' is at 95.17% usage.

There are a few reasons this may happen.

I would recommend opening a support case for this (if this high utilization behavior has persisted for a while).

 

You could take a look at the trend of this behavior in the health.logs ($NNMDataDir/logs/nnm/).

 

These logs, in conjunction with the jbossServer.logs (or nnm.logs for version 9.2x) could point to a more specific problem as the root cause of such behavior.

 

It would also be helpful to know the NNMi version and patch info (nnmversion.ovpl).

 

And as far as troubleshooting PS Old Gen issues go, the most recent health report (nnmhealth.ovpl -print verbose > someTextFile.txt) would help.

Mohit Sharma,
HP Software Support

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