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Full Discussion: Memory usage in AIX server
Operating Systems AIX Memory usage in AIX server Post 302843671 by MichaelFelt on Wednesday 14th of August 2013 11:00:16 AM
Old 08-14-2013
The easy way to know if there has been any paging space activity is to use vmstat -s and look for these lines:
Code:
...
                    0 paging space page ins
                    0 paging space page outs
...

Mine are zero because I have rebooted recently, after applying a patch.

FYI: If you see values here that are not equal to zero - it is "normal" when the out values are (much) larger than the in values - when in values are larger - this implies that you really need more memory - because pages are being read in, and freed again before they can be modified (page space page outs are only modified pages, unmodified they just get freed - i.e., no page space out).

The tools mentioned above are for watching behavior in real time. This is historical data - compare delta daily e.g., for 24 hour stats.

re: lrud (least recently used daemon, aka page stealer) - the lrud watches memory limits per memory pool - so you can have a lot of page stealer activity even with 20% of memory free (according to nmon/vmstat/topas) if only one pool is consumed.

How many memory pools do you have? Use vmstat -v
Code:
 $ vmstat -v
              2359296 memory pages
              2166980 lruable pages
              1203442 free pages
                    1 memory pools
               557005 pinned pages
                 80.0 maxpin percentage
                  3.0 minperm percentage
                 90.0 maxperm percentage
                 13.7 numperm percentage
               297545 file pages
...

 

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SWAPON(8)						      System Manager's Manual							 SWAPON(8)

NAME
swapon - specify additional device for paging and swapping SYNOPSIS
swapon -a swapon name ... DESCRIPTION
Swapon is used to specify additional devices on which paging and swapping are to take place. The system begins by swapping and paging on only a single device so that only one disk is required at bootstrap time. Calls to swapon normally occur in the system multi-user initial- ization file /etc/rc making all swap devices available, so that the paging and swapping activity is interleaved across several devices. Normally, the -a argument is given, causing all devices marked as ``sw'' swap devices in /etc/fstab to be made available. The second form gives individual block devices as given in the system swap configuration table. The call makes only this space available to the system for swap allocation. SEE ALSO
swapon(2), init(8) FILES
/dev/[ru][pk]?b normal paging devices BUGS
There is no way to stop paging and swapping on a device. It is therefore not possible to make use of devices which may be dismounted dur- ing system operation. swapon is not implemented in 2.11BSD. 4th Berkeley Distribution November 17, 1996 SWAPON(8)
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