From: Habeebulla Suhail (suhail@ALRAJHIBANK.COM.SA)
Date: Sat Oct 19 2002 - 09:23:58 EDT
My special thanks to
Simon green, James Jackson, John jolet and Christian sippel for
answering my question.
I can now explain memory utilization to the management properly.
Regards,
Habeebulla Suhail
-----Original Message-----
From: Green, Simon [mailto:SGreen@KRAFTEUROPE.COM]
Sent: Wednesday, October 16, 2002 2:47 PM
To: aix-l@Princeton.EDU
Subject: Re: how to calculate memory utilization on a AIX box
The figure from vmstat is meaningless for your purposes. AIX will
always
find something to do with memory - its too valuable a resource to sit
around
idle - so the free memory is just a small amount kept free to allow for
sudden surges in demand. It bears little or no relation to how much
memory
applications are actually using.
You might consider checking paging stats, but that will only tell you if
you
have enough memory (no paging) or not enough (lots of paging), for the
way
your system is configured.
svmon can give you detailed figures, but it's just a snap-shot. You
need to
install perfagent.tools to use svmon. It's probably your best bet,
though.
Another one to consider is "ps_". This is in bos.perf.pmr and will show
you
memory use over a period of time.
There are documents describing these at...
http://techsupport.services.ibm.com/server/aix.techTips
Simon Green
Philip Morris ITSC Europe
AIX-L Archive at http://marc.theaimsgroup.com/?l=aix-l&r=1&w=2
AIX FAQ at http://www.faqs.org/faqs/aix-faq/
N.B. Unsolicited email from vendors will seldom be appreciated.
> -----Original Message-----
> From: Habeebulla Suhail [mailto:suhail@ALRAJHIBANK.COM.SA]
> Sent: 16 October 2002 12:18
> To: aix-l@Princeton.EDU
> Subject: how to calculate memory utilization on a AIX box
>
>
> Hi all,
>
> I have to give a system resources utilization report to my management,
> on a weekly basis.
>
> I have written some scripts to collect data. For CPU utilization I'm
> using sar and for memory utilization I'm using vmstat.
>
> I'm just using the free mem column and getting an average value. Then
> calculating the percentage from total real memory of the system.
>
> My question:
> 1. Is it correct what I'm doing for memory utilization?
> 2. Can someone give a URL name where I can get more information on how
> to calculate memory utilization on AIX boxes?
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