Messages in this thread | | | Date | Thu, 20 Feb 2003 15:05:59 +0100 | From | Dejan Muhamedagic <> | Subject | Re: vm issues on sap app server |
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Rik,
On Thu, Feb 20, 2003 at 10:21:50AM -0300, Rik van Riel wrote: > On Thu, 20 Feb 2003, Dejan Muhamedagic wrote: > > > # mem | grep Cache > > Cached: 4569128 kB > > SwapCached: 829668 kB > > ActiveCache: 136728 kB > > The "problem" here is that a lot of the memory in Cached: is > mapped into process address space, so in effect it is process > memory. > > This is especially true for executables, libraries and shared > memory segments, which you REALLY want to have treated as process > memory and not as cache... > > This makes the Cached statistic a bit confusing for administrators.
Is there a way to split the statistics? It also sounds confusing :)
> > > In that case you're probably familiar with the cache size > > > tuning, since AIX has the exact same tuning knob as rmap ;) > > > > AIX vmtune -P is equivalent to the Linux cache-max, but cache-max > > is not implemented. > > Doesn't it also have something like the borrow percentage, above > which AIX will only reclaim from the cache, unless the repaging > rate of the cache is higher than that of process memory ?
No, not that I'm aware of. You can check the man page for vmtune yourself:
http://publibn.boulder.ibm.com/doc_link/en_US/a_doc_lib/cmds/aixcmds6/vmtune.htm
BTW, there is also quite a bit of interesting documentation about the AIX VMM.
Cheers!
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