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Re: RFC: ldconfig speedup

From: Andreas Jaeger <aj at suse dot de>
To: Florian Weimer <fw at deneb dot enyo dot de>
Cc: Roland McGrath <roland at redhat dot com>, "GNU C. Library" <libc-alpha at sources dot redhat dot com>, Michael Schroeder <mls at suse dot de>
Date: Sun, 01 Jul 2007 11:02:34 +0200
Subject: Re: RFC: ldconfig speedup
Openpgp: id=C272A126; url=http://www.suse.de/~aj/keys.txt
References: <20070627190237.3CF8A4D05E6@magilla.localdomain> <m3y7i5yzjk.fsf@gromit.moeb> <876455cgf1.fsf@mid.deneb.enyo.de>

Florian Weimer <fw@deneb.enyo.de> writes:

> * Andreas Jaeger:
>
>> Flush filesystem cache, create from scratch:
>> # echo 3 > /proc/sys/vm/drop_caches;time ldconfig -i
>>
>> real    0m24.234s
>> user    0m0.148s
>> sys     0m0.408s
>
> Out of curiosity, is this on ext3?  Have you tried different file
> systems?

This is ext3, I haven't tried others.

> (I would expect that sorting by the d_ino field returned by readdir
> before touching the files would bring a comparable speed-up, at lesser
> complexity.)

I doubt it - it would still mean reading the libraries itself and the
patch avoids reading the libraries.  Sorting by d_ino might help if
there's no cache,

Andreas
-- 
 Andreas Jaeger, Director Platform/openSUSE, aj@suse.de
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