topic high kernel memory usage in Operating System - HP-UX

high kernel memory usage

Asim_4 — Wed, 07 Oct 2009 06:24:33 GMT

HPUX 11.31 IA64Bit 16Gb Physical Memory
Running Oracle RAC
Sys: 5.9gb User: 8.5gb Free: 878mb
there are no page outs at this time, however my fear is if i do not get a good handle on memory usage my system may get into performance issues.

Re: high kernel memory usage

Kapil Jha — Wed, 07 Oct 2009 06:30:16 GMT

Hey Asim,
How r you ;)

Which process shows higher memory utilization from glance.

what about page faults??

Any RAC performance issue??

BR,
Kapil+

Re: high kernel memory usage

Asim_4 — Wed, 07 Oct 2009 07:14:26 GMT

i am good.thanks for asking. here glance output.
MEMORY REPORT Users= 4
Event Current Cumulative Current Rate Cum Rate High Rate
--------------------------------------------------------------------------------
Page Faults 2108 2880 430.2 450.0 551.4
Page In 453 604 92.4 94.3 107.8
Page Out 0 0 0.0 0.0 0.0
KB Paged In 560kb 1.5mb 114.2 241.2 702.8
KB Paged Out 0kb 0kb 0.0 0.0 0.0
Reactivations 0 0 0.0 0.0 0.0
Deactivations 0 0 0.0 0.0 0.0
KB Deactivated 0kb 0kb 0.0 0.0 0.0
VM Reads 67 197 13.6 30.7 26.5
VM Writes 0 0 0.0 0.0 0.0
Total VM : 10.0gb Sys Mem : 5.9gb User Mem: 8.9gb Phys Mem : 16.0gb
Active VM: 3.7gb Buf Cache: 0mb Free Mem: 803mb FileCache: 378mb

Re: high kernel memory usage

Kapil Jha — Wed, 07 Oct 2009 07:18:29 GMT

Is this new server, any changes on this box.
I asked which process is taking more memory.

Have you tried to reboot the box earlier.

BR,
Kapil+

Re: high kernel memory usage

Asim_4 — Wed, 07 Oct 2009 07:21:11 GMT

there are no changes made recently, as far as your question is concerned, i am trying to figure out the same thing, further i also want to understand the high kernel memory usage and if there is anyway i can reduce the usage without causing any issues.

Re: high kernel memory usage

Hasan Atasoy — Wed, 07 Oct 2009 07:37:57 GMT

hi asim;

did you change file_cache_max and file_cache_min values ?

Hasan

Re: high kernel memory usage

Asim_4 — Wed, 07 Oct 2009 07:45:01 GMT

here is the relavent info:
> kctune |grep filecache
filecache_max 1630976819 10% Imm (auto disabled)
filecache_min 815484928 Default Auto

Re: high kernel memory usage

Rahul Rai_1 — Wed, 07 Oct 2009 09:35:46 GMT

Hi Asim,

Did you faced the same problem earlier for memory issue.
What is the size for Oracle SGA was there any change in SGA.
And if any other activity going on the server from oracle point of view.(RMAN backup etc)
Can you post swapinfo -atm
seems lil connection with swap.

Which process from glance is occupying maximum memory?

Regards,
Rahul Rai.