From: sos AT prospect DOT com DOT ru (Sergey Okhapkin)
Subject: File operations speed-up
17 Mar 1997 09:29:58 -0800
Approved: cygnus DOT gnu-win32 AT cygnus DOT com
Distribution: cygnus
Message-ID: <01BC32DD.A9EB1B90.cygnus.gnu-win32@gater.krystalbank.msk.ru>
Original-To: "'Gnu-Win32'" <gnu-win32 AT cygnus DOT com>
Encoding: 21 TEXT, 136 UUENCODE
X-MS-Attachment: archive.diff 0 00-00-1980 00:00
Original-Sender: owner-gnu-win32 AT cygnus DOT com

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.


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