topic Re: Measuring shared memory in Operating System - HP-UX

Measuring shared memory

Simon R Wootton — Fri, 18 Jun 2004 03:58:52 GMT

We have a RP7410 running HPUX 11i. The machine is running out of shared memory which is causing application problems.

Is there a way of looking at the amount of shared memory in use at a given point in time which could be logged over a period of time so I can see how and where it is growing ? Even a percentage used type of measure would be useful.

All help appreciated.
Simon

Re: Measuring shared memory

Sanjay Kumar Suri — Fri, 18 Jun 2004 04:02:32 GMT

top command can be used.

sks

Re: Measuring shared memory

Shaikh Imran — Fri, 18 Jun 2004 04:08:57 GMT

Hi
Install the trial glance plus or measureware.
Also you can try top,vmstat,etc..,

Regards,

Re: Measuring shared memory

Piergiacomo Perini — Fri, 18 Jun 2004 04:12:45 GMT

Hi,

exist also command

ipcs,

and the option "-b"
could be useful.

Regards
pg

Re: Measuring shared memory

Sanjay Kumar Suri — Fri, 18 Jun 2004 04:19:41 GMT

What is the application?
Are you using some database such as Oracle?
Is the context of shared memory related to Oracle?

sks

Re: Measuring shared memory

Steve Lewis — Fri, 18 Jun 2004 06:28:29 GMT

Simon,

Put this script below into crontab and run it every so often. It lists all your shared memory segments with sizes in Kb and Mb.

Steve

echo " ID Perms Owner Size Creator Lastpid"
ipcs -ma | awk '
function sv(val)
{
if (val>=1024000.0) pv=sprintf("%3.2fMb",val/1024000);
else pv=sprintf("%3.2fKb",val/1024);
return pv;
}
{if(NR>3)printf("%6s %10s %8s %10s %6s %6s\n",$2,$4,$6,sv($10),$11,$12)}'

Re: Measuring shared memory

Steve Lewis — Fri, 18 Jun 2004 06:40:36 GMT

Spot my deliberate mistake? ;-)

should be 1048576.0, not 1024000.0.