top lies ?

[Al Boldi]

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!

--
Al

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