File operations speed-up

Chris Schumann Chris_Schumann@dgii.com
Tue Mar 18 08:25:00 GMT 1997


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uses the archive bit to indicate whether a file has been
archived?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...

-
For help on using this list, send a message to
"gnu-win32-request@cygnus.com" with one line of text: "help".



-------------- next part --------------
A non-text attachment was scrubbed...
Name: archive.diff
Type: text/x-diff
Size: 5983 bytes
Desc: not available
URL: <http://cygwin.com/pipermail/cygwin/attachments/19970318/cf52a5b2/attachment.bin>


More information about the Cygwin mailing list