Re: Load avg issue

This happens sometimes lets say once in 3 days or may be some time once in
week.

Let me try to increase the ram.

[root@mailserver root]# free -m
total used free shared buffers cached
Mem: 1000 984 16 0 37 593
-/+ buffers/cache: 353 647
Swap: 1953 316 1636


On 4/13/07, Andrei Pascal <andrei@xxxxxxxxx> wrote:

On Fri, 2007-04-13 at 01:15 -0400, nilesh vaghela wrote:
> We have mail server running with sendmail, horde with front end and
around
> 350 users.
>
> Some time the server indicate very high cpu usage.
>
> What is to be ckeck
>
> We are using RHEL3.
>
>
> 10:49:11 up 91 days, 18:55, 3 users, load average: 11.93, 15.27,
13.87
> 259 processes: 254 sleeping, 4 running, 1 zombie, 0 stopped
> CPU states: cpu user nice system irq softirq iowait idle
> total 66.8% 0.0% 13.2% 0.4% 0.0% 118.8% 0.0%
> cpu00 39.9% 0.0% 7.5% 0.5% 0.1% 51.6% 0.0%
> cpu01 27.0% 0.0% 5.7% 0.0% 0.0% 67.1% 0.0%
> Mem: 1024780k av, 1008968k used, 15812k free, 0k shrd, 13764k
> buff
> 749248k actv, 143504k in_d, 14280k in_c
> Swap: 1999992k av, 437476k used, 1562516k free 558700k
> cached
> --------------
> [root@mailserver root]# ps -el | grep imap | wc -l
> 109
> -----------------

The "iowait" field in the CPU usage status means your processess are
waiting for some data. Check you disk and network latency. 1 GB RAM
should do it, but your swap is bieng hit quite hard. Check vmstat for si
and so (swap in / swap out) - I think that's where youp problem is.

Try stopping unnecessary services or simply add an extra GB of RAM to
that machine.


Regards,
Andrei


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Nilesh Vaghela
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