On Tue, 17 Jun 2008 18:44:54 +0200 Herbert Poetzl <herbert@13thfloor.at> wrote: > On Thu, May 01, 2008 at 04:01:30PM +0200, Lukasz Czarnowski wrote: > > Hi all! > > > > I have discovered small problem - IMHO RSS memory counter work incorrectly. > > If postgresql is running on a vserver: If I set flag VIRT_MEM - `free' show 2698668kB memory is used: > > # vattribute --xid 40003 --set --flag virt_mem > > > > # vserver test exec free > > total used free shared buffers cached > > Mem: 12338224 2698668 9639556 0 0 0 > > -/+ buffers/cache: 2698668 9639556 ^^^^^^^ Else, if I unset flag VIRT_MEM - `free' show 395152kB memory is used: > > # vattribute --xid 40003 --set --flag ~virt_mem > > > > # vserver test exec free > > total used free shared buffers cached > > Mem: 12338224 10658056 1680168 0 19576 10243328 > > -/+ buffers/cache: 395152 11943072 ^^^^^^ and I see the real memory usage (not multipled, 395152kB vs 2698668kB). [...] > > please elaborate what you are seeing ... I add the comment. > > IMO memory pages mapped in multiple (postmaster) processes are counted > > multiple times. Bug or feature? Any hints? > > are they shared read only or mapped in a way that they > get copied on write? SHM Please read this message: http://lkml.org/lkml/2007/2/9/275 and: http://www.nabble.com/configurability-of-OOM-killer-td15236655.html Thank you for your reply. Regards, -- Lukasz Czarnowski relaks@ciach_o2.pl