From:	Chris_Schumann AT dgii DOT com (Chris Schumann)
Subject:	Re: File operations speed-up
18 Mar 1997 12:38:14 -0800 :
Approved:	cygnus DOT gnu-win32 AT cygnus DOT com
Distribution:	cygnus
Message-ID:	<1997Mar18.074816.1839.487459.cygnus.gnu-win32@msp-ln05.dgii.com>
Mime-Version:	1.0
Original-To:	sos AT prospect DOT com DOT ru (Sergey Okhapkin)
Original-Cc:	Gnu-Win32 AT cygnus DOT com ('Gnu-Win32')
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Original-Sender:	owner-gnu-win32 AT cygnus DOT com

--===_1997Mar18.074816.1839.487459===_
Content-Type: text/plain; charset="US-ASCII"

Isn't this useless for those who use backup software that
uses the archive bit to indicate whether a file has been
archived?

ChrisS




	Sergey Okhapkin <sos @ prospect.com.ru> 
	03/17/97 08:03 PM
To: 'Gnu-Win32' <gnu-win32 @ cygnus.com> @ SMTP
cc:  
Subject: File operations speed-up

Hi!

This patch increases the speed of stat/lstat calls dramatically. The trick 
is simple. Cygwin's stat call implementation reads the beginning of stated 
file to look for a "magic cookie" to define "executable" and "symlink" 
attributes of a file. With this patch reading is performed only if file 
have "archive" bit cleared. All ordinary files (not executables/symlinks) 
have this bit set. After applying this patch You have to "chmod +x file" on 
all executables/symlinks. I made a "chmod +x *" on directories with 
binaries. Later I'll write a special utility "fssync" to examine all files 
in a given directory tree and to set archive bit according to file magic 
cookie. Compare the time of "du ." on cygwin's root without and with this 
patch :-)

 

--
Sergey Okhapkin
Moscow, Russia
Looking for a job.


--uuencoded file (archive.diff) attached...

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--===_1997Mar18.074816.1839.487459===_--
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