linux-kernel - Re: high system cpu load during intense disk i/o

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Message-ID: <46B60FB7.8030301@interia.pl>
Date:	Sun, 05 Aug 2007 19:58:15 +0200
From:	Rafał Bilski <rafalbilski@...eria.pl>
To:	Dimitrios Apostolou <jimis@....net>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: high system cpu load during intense disk i/o

> Hello again,
Hi! 
> was my report so complicated? Perhaps I shouldn't have included so many 
> oprofile outputs. Anyway, if anyone wants to have a look, the most important 
> is two_discs_bad.txt oprofile output, attached on my original message. The 
> problem is 100% reproducible for me so I would appreciate if anyone told me 
> he has similar experiences. 
Probably nobody replied to Your message because people at this list think 
that Your problem isn't kernel related. In this moment I'm using "Arch Linux" 
too, so I checked /etc/cron directory. There simple jobs You are talking 
about are not so simple:
- update the "locate" database,
- update the "whatis" database.
Both jobs are scaning "/" partition. I don't know how dcron works, but I can 
imagine situation in which it is polling cron.daily and says: "hey it wasn't 
done today yet" and it is starting same jobs over and over again. More 
and more tasks scans the "/" partition and in result access is slower and 
slower.
> 
> Thanks, 
> Dimitris
Let me know if I'm wrong
Rafał


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