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Re: CPU overhead when handling large files?

To: Seung-yeong Oh <so1713@xxxxxxxxx>
Subject: Re: CPU overhead when handling large files?
From: Chris Wedgwood <cw@xxxxxxxx>
Date: Sat, 18 Jan 2003 14:23:23 -0800
Cc: linux-xfs@xxxxxxxxxxx
In-reply-to: <1042910194.2187.15.camel@xxxxxxxxxxxxxxxxxxxx>
References: <1042910194.2187.15.camel@xxxxxxxxxxxxxxxxxxxx>
Sender: linux-xfs-bounce@xxxxxxxxxxx
User-agent: Mutt/1.3.28i
On Sun, Jan 19, 2003 at 02:16:34AM +0900, Seung-yeong Oh wrote:

> For current seup, I'm wondering if the following behavior is normal;
> When handling large files, for example, copying a few 700MB files from
> one directory to another, at some point in the middle of the process or
> at the end of it, the process hangs for several minutes taking up 99% of
> CPU.

It could be the nasty 2.4.x VM... or maybe not.  How full is your disk
when doing this?  How fragmented (xfs_bmap) are the files when you are
done?

> A friend of mine told me it might take some time to rewrite inodes
> as it's a journaling file system, but I don't remember the XFS acted
> this way before when I was using 1.0.2 of it. And 1.1 for that
> matter...  I'd appreciate any input. Thank you.  Have a nice
> weekend.

Writing/updating the inodes shouldn't be barely noticeable.


 --cw


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