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Subject:	RE: find . -regex '.*js' -type f -exec md5sum '{}' \\; really slow!
From:	Bartolomeo Nicolotti <bnicolotti AT siapcn DOT it>
To:	=?ISO-8859-1?Q?J=F6rg?= Schaible <Joerg DOT Schaible AT scalaris DOT com>
Cc:	cygwin AT cygwin DOT com
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Date:	Mon, 24 Nov 2008 17:03:02 +0100
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Great!

the command 

/usr/bin/find . -type f -exec md5sum '{}' \\;

takes 3min 10s

the command

/usr/bin/find . -type f -exec md5sum \{} +

takes 25s.

the command

find . -type f  | xargs md5sum

takes 17s

Many thanks, best regards!

B.Nicolotti

Il giorno lun, 24/11/2008 alle 16.35 +0100, Jörg Schaible ha scritto:
> cygwin-owner AT cygwin DOT com wrote:
> > Hi,
> > 
> > I'm using  the command:
> > 
> > /usr/bin/find . -type f -exec md5sum '{}' \\;
> > 
> > to compare the content of two subtree(161Mbytes) on different systems,
> > one linux, and the other on windows with cygwin.
> > 
> > The command on linux takes some seconds, while on windows+cygwin
> > takes some minutes. 
> > 
> > Could some one help me to speed-up things on windows+cygwin?
> 
> Don't run the command for each file, try to use as much files as you can on one line (use '+' instead of ';'):
> 
> /usr/bin/find . -type f -exec md5sum \{} +
> 
> Hint: A fork is expensive in Cygwin ...
> 
> - Jörg
-- 
Bartolomeo Nicolotti
SIAP s.r.l.
www.siapcn.it
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Trinità(CN) Italy
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fax: +39 0172 652519


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