Memory use

Glenn Steen glenn.steen at GMAIL.COM
Thu Nov 17 00:04:56 GMT 2005


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On 17/11/05, Glenn Steen <glenn.steen at gmail.com> wrote:
> On 16/11/05, José Angel Blanco González <jose at treelogic.com> wrote:
> > In vmstat, si is always 0, so it is not using swap I suppose. The computer
> > is a mail server with 500 mail accounts, maybe ipopd  or imapd the bug??
> >
> How did you determine that MailScanner dropped in performance? Exactly
> what characteristic are you seeing a problem with?
>
> You'll have to run the vmstat for a bit to be sure there really is no
> swapping, and perhaps look into the sar command (think it's part of
> the sysstat rpm or something similar.... I ditched my last RH9 the day
> after the desupport notice.... (a while back:-), so my recollections
> of exact package details is faint, to say the least...)
> sar will help you (together with top) to determine if you have unusual
> CPU load, which might be an indicator.... For IO, find and use iostat
> in a similar way as you use vmstat.
>
> Until you have some facts, it's way to soon to start assigning blame
> to individual systems/processes:-).
>

Replying to myself.... how ... quaint...:)

If you use mbox format, or indeed if your users have huge
mailboxes.... they might be seeing a big lag at certain message
operations (and definitely when starting their client).
Do you really need to support POP?

--
-- Glenn
email: glenn < dot > steen < at > gmail < dot > com
work: glenn < dot > steen < at > ap1 < dot > se

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