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From: Bernd Eckenfels <ecki-news2002-09@lina.inka.de>
To: linux-kernel@vger.kernel.org
Subject: Re: Very High Load, kernel 2.4.18, apache/mysql
Date: Wed, 25 Sep 2002 05:48:59 +0200	[thread overview]
Message-ID: <E17u3AZ-0005Z0-00@sites.inka.de> (raw)
In-Reply-To: <37EF12D6-D015-11D6-AD2E-000502C90EA3@Whitewlf.net>

In article <37EF12D6-D015-11D6-AD2E-000502C90EA3@Whitewlf.net> you wrote:
> I have been trying to find an answer to this for the past couple weeks, 
> but I have finally broken down and must post this to this list. ;)

Ok, but I wonder a bit about your question. You have a big workload and
therefore a high load on the system, there is nothing much you can do from a
kernel perspecitve about it. I guess the PHP is one of the Problems here,
perhaps you should start to benchmark your mostly used web pages for
database access patttern.

> We also see high amounts of apache children segfaulting under load... 
> as high as 2-10/minute at times.

This is strange. Is this a ressource limit congestion or a apache bug. Which
apache version are you using?

> reducing tcp timeouts, etc. The big users of CPU are typically apache 
> and mysql. About 110+ instances of apache and mysqld each run in top at 
> high load. CPU use bounces wildly, with most in user space.

What are your Apache Parameters for min/max spare, maxclients etc.

> Machines:
> Moya (Which ran OK):

does that mean it run ok and had high load, or does that mean it had not
such a high load?

> Dual Thunder K7 1900+MPs, 1.5Gddr/ecc/reg ram
> dual u160 scsi,   3x18G soft raid 5 /home(ext3), 9G / (ext3) & /boot 
> (ext2) & 512Mb swap

this is a bit small ram, and you are probably better using raid-1 here.

> Anubis:
> Dual PIII  440lx, 1.0Gpc100/ecc ram

this is much slower, no wonder the system is sluggish, if you have CPU bound
tasks. can you post some vmstat results, to see if you are io, cpu or ram
bound.

>   7:04pm  up 1 day, 15:56,  2 users,  load average: 18.95, 17.81, 16.21
> 236 processes: 223 sleeping, 13 running, 0 zombie, 0 stopped
> CPU0 states: 89.1% user, 10.5% system,  0.0% nice,  0.0% idle
> CPU1 states: 84.2% user, 15.4% system,  0.0% nice,  0.0% idle
> Mem:  2061772K av, 1949428K used,  112344K free,       0K shrd,  
> 290984K buff
> Swap: 1493808K av,   48420K used, 1445388K free                  
> 882200K cached

to me this looks good, it is a very balanced workload. No idle time. Your
system seems to be mostly cpu bound here.

Greetings
Bernd

  parent reply	other threads:[~2002-09-25  3:43 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2002-09-24 23:27 Very High Load, kernel 2.4.18, apache/mysql 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
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 [this message]
     [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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