[imp] Severe Performance Issue on High-End System

[Henry Blackman]

You should probably run top while users test IMP.  That will identify what
exactly is taking up all the processing power of your server.  If you feel
it's MySQL you should probably look into it's configuration and check that
indexes are there; I run IMP for staff at my institution on a server very
much lower in power than yours (but like yours mine runs IMAP, MySQL and web
too) and I have up to 20% of people using it from several hundred staff with
absolutely no problems.

You should also check a couple of things (like that mail isn't being scanned
just to show the attachments icon, and like you have an appropriate mailbox
format (mbox) used to reduce disk thrashing).  All these things can reduce
load.

Good luck,
Henry

----- Original Message -----
From: "Robert Zrim" <project@fastrun.at>
To: <imp@lists.horde.org>
Sent: Wednesday, May 01, 2002 7:46 PM
Subject: [imp] Severe Performance Issue on High-End System


> Hi All,
>
> I have an environment set up with Horde 2.0, IMP 3.1 and Turba as well as
> Kronolith in their latest versions.
> I am using UW Imap and Mysql on a Linux platform. (All on the same
machine).
>
> I run into trouble as soon as my users access the system,
> we have 5.000 active users, but that should not be the issue as most
> of them dont use IMP, but download their mails to a pop client.
>
> I have limited IMP to a maximum of 5 (!) simultaneous users, which is
> ridiculos,
> still - As soon as some guys log in, server load (average) jumps from 0.05
> to above 20.00 and
> soon after the machine locks up. I see that there a quite a few mysql
> instances running,
> could that be it ?
>
> Im confused because my machine is a IBM netfinity multiproc monster and
> usually performs
> VERY well.
>
> Do you have any tested load parameters to share ?
>
> Thanks,
>
> Robert
>
>
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