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SubjectRe: /proc/<pid>/status: VmSize
From
Date
 In addition, here are status and statm files:

[ status ]

Name: v
State: S (sleeping)
Tgid: 15675
Pid: 15675
PPid: 15651
TracerPid: 0
Uid: 502 502 502 502
Gid: 502 502 502 502
FDSize: 16384
Groups: 502 10
VmSize: 2111108 kB
VmLck: 0 kB
VmRSS: 1114900 kB
VmData: 190332 kB
VmStk: 40 kB
VmExe: 28 kB
VmLib: 5424 kB
SigPnd: 0000000000000000
SigBlk: 0000000080000000
SigIgn: 0000000000001000
SigCgt: 0000000380000002
CapInh: 0000000000000000
CapPrm: 0000000000000000
CapEff: 0000000000000000
[ statm ]

425731 278725 180470 8 276340 2377 276132


On Fri, 2003-11-28 at 20:18, Vladimir Zidar wrote:
> Hola,
>
> We are running kernel 2.4.22 on i686 SMP box.
> Inside are two Intel(R) XEON(TM) CPU 2.00GHz, with hyperthreading
> enabled, so /proc/cpuinfo shows four CPUs.
> This box has 4GB of RAM installed, and 2GB of swap space.
>
> The problems we are experiencing are related to heavy usage of VM.
>
> We have multithreaded application that uses lots of mmap()-ed memory
> (one big file in size around 700 MB, and lots of anonymous mappings to
> /dev/zero in average size between 64k and 1MB). This program sometimes
> grow up to 1.6 GB in size (SIZE that is shown by top utility).. But,
> sometimes /proc/<pid>/status shows VmSize with more than 2GB, where at
> the same time top and other /proc/<pid> entries show 1.6GB. This somehow
> affects pthread_create() call which fails then.
>
> The question is, how can happen that different numbers are shown in
> proc filesystem, for same pid ? (which is part of multithreaded
> process), and why pthread_create() fails ? Is there maybe 2GB limit on
> memory size that single process can manage on i386 ? Also, when such
> program crashes, it creates 2GB core file, which is not completly usable
> from gdb. (gdb complains that some addresses are not accessible)..
> I suspect that this has something to do with amount of RAM (4GB), but
> we are still trying to get this server tested with only 2GB running in
> standard (not paged) mode.. but this can take some time, since it is one
> of our production machines.
>
>
> Anybody, idea ?
>
> Thanks.
--

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