On Fri, 7 Apr 2006, Casey Allen Shobe wrote:
>
> b.www hosts websites for several clients. Among these is one who sends out a
> mailing to a couple thousand people every day, using a commercial PHP-based
> mailing list management program (*sigh*) called 1-2-all
> (http://www.activecampaign.com/12all/). With the (fairly standard) qmail
> setup, everything ran quietly and fine. After switching to exim, when the
> mails are sent out each midday, load on b.www rises above 5, and load on
> a.msa rises above 16. These numbers are consistant from day to day.
>
> What am I doing wrong?
You probably want to set your queue_only_load to be quite low, to stop
exim trying immediate deliveries when the machine is busy. You might want
to experiment with a two-stage queue runner (exim -qq) to see if that
drains the queue faster than a standard queue runner.
> That may keep the load from spiking so much on a.msa, but the mystery
> remains - why does the load go up at all on b.www? That makes no sense to
> me.
Disk load. Exim is not particularly heavily optimised in this area. Try
no_message_logs, split_spool_directory and also putting spool/exim/db on a
ram disk and putting Exim's logs on a different disk from its spool.
Tony.
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