[Linux-Discussion] Re: Tip: syslogd
- From: James Gosnell <goose@xxxxxxxxxxxx>
- To: linux-discussion@xxxxxxxxxxxxx
- Date: Thu, 30 Nov 2000 15:58:45 -0500
John Madden wrote:
>
> Just a quick tip for anyone sending a lot of email or something: I noticed
> on avenir.dhs.org (the box that runs FreeLists, of course) that syslogd
> would soak up a lot more cpu than even postfix, which does all the mail
> processing and sending (the MTA).
>
> I started asking around on the postfix-users mailing list for tips on how
> to prevent postfix from sending so much log data to syslogd, but instead I
> got answers on how to improve syslogd. :)
>
> Basically, the problem is that syslogd will write to syslog and messages
> (filenames differ depending on your distribution) constantly (by default),
> which can cause some I/O issues if there's a lot going on on your disk(s),
> especially if you use IDE.
>
> The trick is to edit /etc/syslog.conf and put a '-' dash in front of the
> filenames that are being written to. So for example, you may now have
>
> *.=info;*.=notice -/usr/adm/messages
>
> in there. This forces asynchronous writes on the log file(s) you specify,
> which helps a LOT with performance. Where syslogd was typically taking up
> 5-9% of the cpu, it now runs at about 0.1-0.3%. That's quite an
> improvement, and since FreeLists can end up sending out a peak of about
> 30,000 emails a day (rough estimate there), that little bit helps a great
> deal.
>
> John
>
cool
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