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Re: how to increase speed to iterate all file's name in a XFS , about mi

To: hank peng <pengxihan@xxxxxxxxx>
Subject: Re: how to increase speed to iterate all file's name in a XFS , about million files.
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Wed, 29 Sep 2010 11:01:32 +1000
Cc: linux-xfs@xxxxxxxxxxx
In-reply-to: <AANLkTimnxM_cqYAR6LK3foeZJ=sz5Xn7vm6uXeXHR_Ew@xxxxxxxxxxxxxx>
References: <AANLkTikd2Gf-=jimO-OvKb-66UquPkjfCN=+bx-3fhY-@xxxxxxxxxxxxxx> <20100929004809.GI5665@dastard> <AANLkTimnxM_cqYAR6LK3foeZJ=sz5Xn7vm6uXeXHR_Ew@xxxxxxxxxxxxxx>
User-agent: Mutt/1.5.20 (2009-06-14)
On Wed, Sep 29, 2010 at 08:55:08AM +0800, hank peng wrote:
> 2010/9/29 Dave Chinner <david@xxxxxxxxxxxxx>:
> > On Wed, Sep 29, 2010 at 08:28:08AM +0800, hank peng wrote:
> >> Hi:
> >> I have a XFS file system which contains about million files in it. I
> >> want to iterate all file's name using readdir function and I found
> >> that a little time-consuming.
> >> Anybody to suggest a way to increase its speed?
> >
> > In what way was it time consuming? IO bound? CPU bound? something
> > else?
> >
> I think it is IO bound,

Can you post the output of 'iostat -x -m 5' while the readdir is in
progress so we can determine if that is true or not?

> file names information is scattered in whole
> partition, right?

No, not usually.

Cheers,

Dave.
-- 
Dave Chinner
david@xxxxxxxxxxxxx

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