From: Green, Simon (SGreen@KRAFTEUROPE.COM)
Date: Wed Oct 16 2002 - 07:47:26 EDT
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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