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Operating Systems AIX PGSP value in svmon command on AIX 5.3 Post 302296355 by zxmaus on Wednesday 11th of March 2009 02:55:17 AM
Old 03-11-2009
Hi,

you have an issue with real memory ... you are using 60% more computational than you have physically in the system - so obviously your system is paging a lot - and you do allow your system even to page computational memory - this slows down your system and is causing your memory warnings. If you don't rapidly add memory, your system will crash once the pagingspace is full - and this won't take too long ...

You have physically 1 GB in your box ...
you are using for computational reasons 406397 x 4k pages = 1.6 GB and you are allowing the paging of computational pages: lru_file_repage = 1 so your system is doing exactly what it is supposed to do - whenever a new process is forked, the amount of pagingspace in use will grow - and the AIX kernel will use more memory over time since he is growing continuously - even when that is not much.

Recommendation is to add memory until your avm value is around 70% of your physical memory (so about 1.5 GB memory).

As a rule of thumb - AIX and background processes like you have them hopefully on your box (nmon, monitoring, whatever) are eating up usually between 500 and 1500 MB memory - everything above this is memory for the applications - in your case there is nothing above ...

Just for my curiosity - are you running websphere or mq on this box ?

Rgds
zxmaus
 

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MEMORY_PRESSURE(1)					    BSD General Commands Manual 					MEMORY_PRESSURE(1)

NAME
memory_pressure -- Tool to apply real or simulate memory pressure on the system. SYNOPSIS
memory_pressure [-l level] | [-p percent_free] | [-S -l level] OPTIONS
-l <level> Apply real or simulate memory pressure (if specified alongside simulate argument) on the system till low memory notifications cor- responding to <level> are generated. Supported values are "warn" and "critical". -p <percent_free> Allocate memory till the available memory in the system is <percent_free> of total memory. If the percentage of available memory to total memory on the system drops, the tool will free memory till either the desired percentage is achieved or it runs out of memory to free. -S Simulate memory pressure on the system by placing it artificially for <sleep_seconds> duration at the "warn" or "critical" level. -s <sleep_seconds> Duration to wait before allocating or freeing memory if applying real pressure. In case of simulating memory pressure, this is the duration the system will be maintained at an artifical memory level. DESCRIPTION
A tool to apply real or simulate memory pressure on the system SEE ALSO
vm_stat(1) Mac OS X Mar 7, 2013 Mac OS X
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