Date: Tue, 16 Mar 2004 21:45:34 +0100
From: =?iso-8859-1?Q?J=F6rn?= Engel <joern@wohnheim.fh-wedel.de>
To: Horst von Brand <vonbrand@inf.utfsm.cl>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: unionfs
Message-ID: <20040316204534.GB22482@wohnheim.fh-wedel.de>
References: <20040316180413.GA22482@wohnheim.fh-wedel.de> <200403161940.i2GJeP6m007930@eeyore.valparaiso.cl>
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On Tue, 16 March 2004 15:40:24 -0400, Horst von Brand wrote:
> > 
> > $ cp -cr dir1 dir2
> > 
> > Behaves similar to 'cp -lr', but creates COWs instead of hard links.
> > Can take a few seconds to create the directories, but not minutes.
> 
> Why does it magically take less time? The work done (recursing, fiddling
> with directories, syscalls, ...) is nearly the same.

joern@limerick:~$ time cp -lr /usr/src/linux/ /tmp/linux

real    0m22.356s
user    0m0.167s
sys     0m1.480s
joern@limerick:~$ rm -r /tmp/linux/
joern@limerick:~$ time cp -r /usr/src/linux/ /tmp/linux

real    1m44.147s
user    0m0.499s
sys     0m7.987s

'nuf said, eot.

J?rn

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