linux-kernel - Re: top lies ?

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Date:	Tue, 13 Nov 2007 12:49:16 +0530
From:	"Balbir Singh" <balbir@...ux.vnet.ibm.com>
To:	"Al Boldi" <a1426z@...ab.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: top lies ?

On Nov 13, 2007 12:38 PM, Al Boldi <a1426z@...ab.com> wrote:
> kloczek wrote:
> > Some data showed by top command looks like completly trashed.
> > Fragment from top output:
> >
> > Mem:   2075784k total,  2053352k used,    22432k free,    19260k buffers
> > Swap:  2096472k total,      136k used,  2096336k free,  1335080k cached
> >
> >    PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  SWAP nFLT
> > WCHAN     COMMAND 14515 mysql     20   0 1837m 563m 4132 S   39 27.8
> > 27:14.20 1.2g   18 -         mysqld
> >
> > How it is possible that swap ussage is 136k and swapped out portion of (in
> > this case) mysqld process is 1.2g ?
>
> Welcome to OverCommit, aka OOM-nirvana.
>
> Try this:
> # echo 2 > /proc/sys/vm/overcommit_memory
> # echo 0 > /proc/sys/vm/overcommit_ratio
>
> But make sure you have enough swap.
>
>
> Thanks!

The swap cache looks pretty big, may be top is including that data
while reporting swap usage.

Balbir
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