AIX 6.1 memory tuning Post: 302887197

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Operating Systems AIX AIX 6.1 memory tuning Post 302887197 by dzodzo on Thursday 6th of February 2014 09:43:29 AM

02-06-2014

Registered User

vmstat -v shows that about 20% of memory pages are pinned (that would roughly correspond to those 13 GB for kernel). Does it mean that application doesn't use memory pinning (server is running Oracle+SAP)? svmon tells me that oracle and workprocesses use about 33 MB of pinned memory, perhaps it's the way they are designed. I'll have to check on some testing system what happens, if you continually increase memory for aplication, how it will affect OS behaviour.

Code:

             16842752 memory pages
             16281136 lruable pages
              2796643 free pages
                    5 memory pools
              3415001 pinned pages
                 80.0 maxpin percentage
                  3.0 minperm percentage
                 90.0 maxperm percentage
                 13.8 numperm percentage
              2258042 file pages
                  0.0 compressed percentage
                    0 compressed pages
                 13.8 numclient percentage
                 90.0 maxclient percentage
              2258042 client pages
                    0 remote pageouts scheduled
                  237 pending disk I/Os blocked with no pbuf
                    0 paging space I/Os blocked with no psbuf
                 2228 filesystem I/Os blocked with no fsbuf
                    0 client filesystem I/Os blocked with no fsbuf
                22230 external pager filesystem I/Os blocked with no fsbuf
                 70.0 percentage of memory used for computational pages

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LEARN ABOUT MOJAVE

memory_pressure

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