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From: "Paweł Krawczyk" <kravietz@aba.krakow.pl>
To: Simon Kirby <sim@netnation.com>
Cc: Adam Goldstein <Whitewlf@Whitewlf.net>, linux-kernel@vger.kernel.org
Subject: Re: Very High Load, kernel 2.4.18, apache/mysql
Date: Wed, 25 Sep 2002 09:51:59 +0200	[thread overview]
Message-ID: <20020925075159.GD28695@aba.krakow.pl> (raw)
In-Reply-To: <20020925072026.GA9670@netnation.com>

On Wed, Sep 25, 2002 at 12:20:26AM -0700, Simon Kirby wrote:

> Again, not locking, but fsync().  It's safe providing your machine never
> crashes. :)  Of course, there's still a chance it can be corrupted
> _with_ fsync() anyway, but the difference is the clients will get a
> result beore it guarantees the data will be on disk.

Many Linux distributions configure syslog to use synchronous writes
for each logged line, which caused very high load on busy systems
I've seen.

Go through your /etc/syslog.conf and change every "/var/log/messages"
to "-/var/log/messages", the minus enables asynchronous writes.

Also try disabling logging for Apache at all for some time (set ErrorLog,
AccessLog or CustomLog to /dev/null) and see what happens.

-- 
Paweł Krawczyk, Kraków, Poland  http://echelon.pl/kravietz/
horses: http://kabardians.com/
crypto: http://ipsec.pl/

  reply	other threads:[~2002-09-25  7:46 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2002-09-24 23:27 Adam Goldstein
2002-09-25  0:59 ` Roger Larsson
2002-09-25  1:28   ` Rik van Riel
2002-09-25  2:38     ` Adam Goldstein
2002-09-25  5:24       ` Simon Kirby
2002-09-25  6:56         ` Adam Goldstein
2002-09-25  7:20           ` Simon Kirby
2002-09-25  7:51             ` Paweł Krawczyk [this message]
2002-09-25 13:13       ` Rik van Riel
2002-09-25 22:54       ` Jose Luis Domingo Lopez
2002-09-26 17:09       ` Joachim Breuer
2002-09-26 17:16         ` Rik van Riel
2002-09-25  3:50     ` Bernd Eckenfels
2002-09-25  3:48 ` Bernd Eckenfels
     [not found] <3D90FD7B.9080209@wanadoo.fr>
2002-09-25  1:12 ` Adam Goldstein
     [not found] <0EBC45FCABFC95428EBFC3A51B368C9501AF4F@jessica.herefordshire.gov.uk>
2002-09-25 20:16 ` Adam Goldstein
2002-09-25 21:26   ` Roger Larsson
2002-09-26  3:03   ` Ernst Herzberg
2002-09-26 18:36     ` Marco Colombo
2002-09-26 19:27       ` Rik van Riel
2002-09-26 20:02         ` Marco Colombo
2002-09-26 20:09           ` Rik van Riel
2002-09-26 20:25         ` Ernst Herzberg
2002-09-27  8:52       ` Martin Brulisauer
2002-10-01  5:36   ` David Rees

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