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: > > # 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 > Swap: 2064376 0 2064376 > > # 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 > Swap: 2064376 584 2063792 > > # cat /proc/virtual/40003/limit | egrep '(RSS|SHM)' > RSS: 635502 0/ 2323079 -1/ -1 0 > SHM: 135016 0/ 135016 -1/ -1 0 > > top: > > 27757 postgres 15 0 589m 495m 491m S 0 4.1 0:02.16 postmaster > 27762 postgres 15 0 586m 5404 4024 S 0 0.0 0:00.00 postmaster > 28258 postgres 18 0 586m 14m 13m S 0 0.1 1:11.82 postmaster > 28260 postgres 15 0 58008 1220 556 S 0 0.0 0:02.35 postmaster > 28262 postgres 15 0 586m 521m 520m S 0 4.3 0:49.67 postmaster > 28263 postgres 15 0 61076 1964 288 S 0 0.0 13:04.75 postmaster > 28264 postgres 15 0 60396 1320 396 S 0 0.0 8:07.99 postmaster > 28685 postgres 15 0 593m 493m 486m S 0 4.1 0:17.00 postmaster > 31444 postgres 15 0 588m 134m 131m S 0 1.1 0:01.35 postmaster > 31449 postgres 21 0 587m 441m 440m S 0 3.7 0:00.78 postmaster > ... please elaborate what you are seeing ... > 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? best, Herbert > Linux version 2.6.22.19 (64bit) vs2.2.0.6 > util-vserver: 0.30.215 > > Best regards, > -- > Lukasz Czarnowski > mailto: relaks@o2.pl