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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 17:09:01 +0100
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Hi,

but the command

find . -type f  | xargs md5sum

has problems with blanks in the name of the files:

md5sum: ./Pdf/1226503623_Offerta: No such file or directory
md5sum: Speciale: No such file or directory
md5sum: Vilnius.pdf: No such file or directory
md5sum: ./DynPkg/Fly/Old/Copy: No such file or directory
md5sum: of: No such file or directory
md5sum: volisearchstep3.php: No such file or directory
md5sum: ./DynPkg/Fly/Old/Copy: No such file or directory
md5sum: of: No such file or directory
md5sum: ./DynPkg/Fly/Old/Copy: No such file or directory
md5sum: of: No such file or directory
md5sum: flightconfirmandata.php: No such file or directory
md5sum: ./DynPkg/Fly/Old/Copy: No such file or directory
md5sum: of: No such file or directory
md5sum: volisearchstep3.php: No such file or directory
md5sum: ./Pdf/1226503623_Offerta: No such file or directory
md5sum: Speciale: No such file or directory
md5sum: Vilnius.pdf: No such file or directory

Many thanks, best regards.

B.Nicolotti

Il giorno lun, 24/11/2008 alle 17.03 +0100, Bartolomeo Nicolotti ha
scritto:
> 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
v.S.Albano 13 12049
Trinità(CN) Italy
ph:+39 0172 652553
centralino: +39 0172 652511
fax: +39 0172 652519


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