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From John <>
Subject Re: [users@httpd] Strange Problem
Date Mon, 28 Mar 2005 13:24:29 GMT

From: Yannis Tsakiris <>
To: <>
Date: Monday, March 28, 2005, 3:27:24 PM
Subject: [users@httpd] Strange Problem

  Monday, March 28, 2005, 3:27:24 PM, you wrote:

  > Hi there,
> This is a problem I'm facing for a long  time.
> I have a server which serves advertisement banners  (with
> phpAdsNew). The apache web server is the only application this
> server runs  (there is no database server or other service running).
> The machine consists of two pIII CPUs at 1000MHz  and is equiped with 1 GB of RAM.
> It serves approximately 300,000 requests per hour  at rush hour.
> The load average reaches a peak of 0.50 at this  load.
> So far so good, but in an arbitrary moment all  apache processes
> stop serving requests, and all of the processes are trying to 
> consume a lot of cpu time, and load average is increasing very fast
> (at the end  the load average is almost equal to the number of
> running apache processes,  which is 500). In this condition the
> server is not responding and all I can do  is to reboot the machine.
> When this strange thing happens varies. It can  happen after a
> few hours of uptime, or it can suddenly happen after 20 days  since
> the last reboot. Anyway, it is ok to say that this thing happens
> about  once in a week.
> I have read the logs, both apache's and system's  but there is
> nothing. Not a clue. Everything seems to stop at the time of the 
> "crash". All logs stop at this moment without a error message.
> There is a crontab that restarts the apache server  every day,
> late at night when the traffic is in its lowest. (but this does not 
> seem to help...)
> The versions of the software I'm using is: SuSE  Linux 9.1 ,
> Linux kernel 2.4.21-99-smp4G (the precompiled kernel that comes with
> SuSE 9.1), Apache 2.0.52 , PHP 4.3.11, Turck mm-cache 2.4.6 
> Any ideas? Your help will be very much  appreciated.
> Yannis Tsakiris


How many servers are busy during the crash? (if you are monitoring
Apache status through mrtg graphs)

Anything in /var/log/messsages, warn ?

It can be a hardware problem that everything hangs.

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