topic High Memory with installation in Operating System - HP-UX

High Memory with installation

Ahmed_58 — Tue, 03 Mar 2009 10:08:43 GMT

Dears,
new OS installed on L3000 the memory utilization shows 30% with nothing started yet like oracle, application etc. is this normal?

server CPU is 4x875Mhz and Memory 4Gb

Memory PID Process
16.57 MB 2160 midaemon
13.12 MB 2265 coda
8.62 MB 2384 naviagent
6.68 MB 2544 mstragent
6.15 MB 1975 cimserver
5.80 MB 2458 mstragent
5.58 MB 2426 vxsvc
5.21 MB 2194 perfalarm
5.03 MB 2225 ovcd

regards,
Ahmed

Re: High Memory with installation

Duncan Edmonstone — Tue, 03 Mar 2009 10:17:50 GMT

There are different ways of measuring memory utilisation... where did your 30% value come from? This could include for instance buffer cache which can take up quite a lot of memory and add very little with Oracle...

Thats said 4GB (note GB not Gb - lower-case b = bits, upper case B = Bytes) is not a lotof memory for an Oracle server...

HTH

Duncan

Re: High Memory with installation

Avinash20 — Tue, 03 Mar 2009 10:19:11 GMT

Hi,

20-30 % of memory utilized by server is normal but without any application running on it.. may be its better to have a check

Could you post me the output of

# kmtune| grep dbc_max_pct

By default its is 50%.

It better to decrease this to 10 - 15% depending on the application .
In case of Oracle decrease this kernel parameter to lower value after consulting with application team and increase the SGA.

Re: High Memory with installation

Ahmed_58 — Tue, 03 Mar 2009 10:29:55 GMT

Hi,
the 30% is from Glance, ..

kmtune| grep dbc_max_pct
dbc_max_pct 50 Default Immed

Ahmed

Re: High Memory with installation

Duncan Edmonstone — Tue, 03 Mar 2009 10:39:46 GMT

look again in glance at the bar for memory utilization. See the values between the "B"'s? This shows the amount of memory consumed by buffer cache. This can go as high as dbc_max_pct of memory and as low as dbc_min_pct of memory. When the system is under memory pressure, the buffer cache will give up pages back to the system all the way down to dbc_min_pct.

If this system is going to run Oracle, you might want to tune these values down a bit as Oracle will generally do a better job of caching its own data in the SGA than the system will. As you don't have much memory anyway, I'd go for something like 5% min and 15% max. Use SAM or the kmtune command to change these values.

HTH

Duncan

Re: High Memory with installation

Ahmed_58 — Tue, 03 Mar 2009 11:24:30 GMT

Duncan,
I done the chance according to your suggestion:
dbc_max_pct 10 - 10

for dbc_min_pct 5 Default Immed

but still memory shows 30% after restart the server, nothing started yet, and NO one access to the server other then myself.

this is new installation 11.23 on L3000.

Ahmed

Re: High Memory with installation

Avinash20 — Tue, 03 Mar 2009 13:40:47 GMT

Hi,

I would request you to run kmeminfo script on the server

You could one from

http://forums11.itrc.hp.com/service/forums/questionanswer.do?threadId=1048211

Transfer it to your server via fTP in binary format to HP-UX (assume /tmp) and do the following

# cd /tmp
# ./kmeminfo.bin -v

#/tmp/kmeminfo -V >> /tmp/kminfo.txt
#/tmp/kmeminfo >> /tmp/kminfo.txt
#/tmp/kmeminfo -user >> /tmp/kminfo.txt
#/tmp/kmeminfo -arena > /tmp/kmeminfo.arena

Please post the /tmp/kminfo.txt and /tmp/kmeminfo.arena

This output will provide us the memory utilization on user and system basis

Re: High Memory with installation

Ahmed_58 — Wed, 04 Mar 2009 11:18:41 GMT

Hi,
Attached is the requested info.

Re: High Memory with installation

Ahmed_58 — Wed, 04 Mar 2009 11:22:53 GMT

And second output also attached here.
Ahmed