top a iowait

Aleš Kozumplík al_es na seznam.cz
Úterý Únor 15 21:44:37 CET 2005


On Monday 14 February 2005 02:10 pm, Zdenek SUTR Kaminski wrote:
> Zdravim,
>
>  na serveru nam bezi nejaka databazova aplikace. Vysledek topu vypada
> obcas nasledovne:
>
>
>  14:02:06  up 4 days, 19:16,  4 users,  load average: 2.21, 2.19, 2.12
> 217 processes: 215 sleeping, 1 running, 1 zombie, 0 stopped
> CPU states:  cpu    user    nice  system    irq  softirq  iowait    idle
>            total    0.0%    0.0%    1.8%   0.0%     0.0%   12.1%   85.9%
>            cpu00    0.0%    0.0%    0.0%   0.0%     0.0%   19.2%   80.7%
>            cpu01    0.0%    0.0%    0.0%   0.0%     0.0%    0.0%  100.0%
>            cpu02    0.0%    0.0%    7.4%   0.0%     0.0%   25.9%   66.6%
>            cpu03    0.0%    0.0%    0.0%   0.0%     0.0%    3.7%   96.2%
> Mem:  3837380k av, 3705120k used,  132260k free,       0k shrd,  244728k
> buff
>                    1676632k actv, 1164716k in_d,   90284k in_c
> Swap: 4096312k av,   14552k used, 4081760k free                 2638592k
> cached
> ...
>
> Zda se, ze problemem by v budoucnu mohly byt IO operace? Kde mam prosim
> dale badat a hledat potencialni uzke hrdlo?
>
> Jedna se o RHEL 3 AS, 2.4.21-15.ELsmp.
>
> Z.K.
>
dd,

resil jsem podobny problem minuly tyden - mrknete na vlakno "DMA u sata". ma 
to docela zajimavy zaver ohledne 2.6 jadra.

Al_


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