topic Re: memory problem in Operating System - HP-UX

memory problem

remer — Tue, 04 Sep 2007 04:55:40 GMT

hi,

i have a system which 32GB of memory and has a 40 running application which has 167MB RSS/VSS per application.
my problem is everytime the 40 application is running my memory utilization increases rapidly up to 74% memory usage.
how can i eliminate the rapid increase in memory usage and what kernel tunables can i change to eliminate this problem?
is there a way i can release the memory that have already been used as buffer cache?

thanks.

Re: memory problem

Wim Rombauts — Tue, 04 Sep 2007 06:35:59 GMT

Can you be a little more specific ?
With the information you give, I can only see two global options :
1) Your applications use more then 167MB/application by spawning child processes which each consume additional memory. Do you have glance available on your system ?
2) Is it that the buffer cache of the system is growing because your applications are intensively using the filesystem ? Check kernel tunable dbc_max_pct.

Re: memory problem

Wim Rombauts — Tue, 04 Sep 2007 06:37:52 GMT

Can you be a little more specific (OS version, where do you see memory usage, ... ?
With the information you give, I can only see two global options :
1) Your applications use more then 167MB/application by spawning child processes which each consume additional memory. Do you have glance available on your system ?
2) Is it that the buffer cache of the system is growing because your applications are intensively using the filesystem ? Check kernel tunable dbc_max_pct, but this tunable is depricated in HP-UX 11i v2

Re: memory problem

remer — Tue, 04 Sep 2007 06:47:46 GMT

Re: memory problem

remer — Tue, 04 Sep 2007 06:54:45 GMT

thanks i already figured out a solution.