Messages in this thread | | | From | Denis Vlasenko <> | Subject | Re: Swap strangeness: total VIRT ~23mb for all processes, swap 91156k used - impossible? | Date | Thu, 28 Oct 2004 14:44:53 +0300 |
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On Thursday 28 October 2004 14:34, Jan Engelhardt wrote: > >I think VIRT is a total virtual space taken by process, part of > >which may be swapped. VIRT can't be reduced by swapping out - > >correct me if I'm wrong. > > I always went by: > VIRT = RES + SWAPPED OUT > > $ ps aufwwx | grep mingetty > #user pid %cpu %mem vsz rsz > root 2490 0.0 0.2 1548 552 tty1 Ss+ Oct25 0:00 /sbin/mingetty tty1 > $ swapoff -a ## for fun > $ ps aufwwx | grep mingetty > root 2490 0.0 0.2 1548 632 tty1 Ss+ Oct25 0:00 /sbin/mingetty tty1 > > So to say, VIRT = RES + SHR + SWAPPED OUT, probably. > > >But I believe even if I'm wrong on that, I simply do not have > >90 mbytes to be swapped out here! > > Have <= 128 MB RAM? Have a heavy busy system (even with >= 128)?
128mb. System was idle, fresh after boot.
Seems I wasn't clear enough. I will try harder now:
Even if I add up size of every process, *counting libc shared pages once per process* (which will overestimate memory usage), I arrive at 23mb *total memory required by all processes*. How come kernel found 90mb to swap out? There is NOTHING to swap out except those 23mb!
(Of course when oom_trigger was running, kernel first swapped out those 23mb and then started swapping out momery taken by oom_trigger itself, but when oom_trigger was killed, its RAM *and* swapspace should be deallocated. Thus I expected to see ~20 mb swap usage). -- vda
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