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Memory usage in AIX server


 
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Operating Systems AIX Memory usage in AIX server
# 8  
Old 08-14-2013
# 9  
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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