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Old 04-20-2013, 10:36 AM   #1
Registered: Aug 2007
Posts: 284

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Question Memory Utilization

Hi AIX Gurus,

I am confused which command is used for Memory utilization vmstat,nmon,topas,sar?

Kindly suggest.

As in case of nmon, if it is showing 98% wheather it is actual run time usage or includes avm (Virtual Memory)? like in Linux it use the memory from buffers/cache.
Old 04-22-2013, 10:03 PM   #2
Registered: Sep 2004
Distribution: AIX, RHEL, Ubuntu
Posts: 51

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AIX and most system commands consider memory 'used' if it is used by process or cache. Most systems under load will only have a couple 100 MB free ( this is tunable, check the vmo man page for details )

This will give a good summary:
svmon -O unit=MB
nmon's memory display ( 'm' ) is probably the quickest and simplest way to get a quick overview. The rightmost section breaks it down into Process, System, Cached and Free, which is an oversimplification but probably all you need 95% of the time.

This is a good writeup of how AIX uses memory:
Old 04-23-2013, 12:30 AM   #3
Registered: Aug 2007
Posts: 284

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Many Many THANKS Wingnut64.


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