From:	kh AT wg DOT icl DOT co DOT uk (Kevin Hughes)
Subject:	RE: Cygwin Performance - especially on a network
10 Apr 1998 19:35:54 -0700 :
Message-ID:	<01BD62F3.1A455BD0.kh.cygnus.gnu-win32@wg.icl.co.uk>
Reply-To:	"kh AT wg DOT icl DOT co DOT uk" <kh AT wg DOT icl DOT co DOT uk>
To:	"'Earnie Boyd'" <earnie_boyd AT hotmail DOT com>
Cc:	"gnu-win32 AT cygnus DOT com" <gnu-win32 AT cygnus DOT com>

Earnie,
	sorry about the long delay but I have been refining the measures etc. and 
doing other work.

The latest set of results for the open/fstat/close sequence are as follows: 
(where times are in milliseconds (I hope))


Local file access

	Min	"Typical"	Max
Gnu/Cygnus	2.8	3.0	4.4
Gnu/NT	0.73	0.8	1.7
VC++	0.75	0.8	2.85

Remote file access

	Min	"Typical	Max
Gnu/Cygnus	10.8	11.0	18.6
Gnu/NT	3.4	3.5	5.0
VC++	3.4	3.5	6.0

I have also looked at the file accesses per open/fstat/close

	Local	Remote
Gnu/Cygnus	20	23
Gnu/NT	5	7
VC++	5	7

The cost and accesses ration perfectly - the cost is all down to the extra 
accesses that the cygnus layer issues.

I guess this is all to do with the emulation of the Unix filestore 
semantics but I do not understand why. I would have thought that a simple 
stat to determine if its a link and then an open would be sufficient - but 
I am very naive in this.

Any information much appreciated.

Kevin

PS - I have read that NtOpenFile bypasses the win32 layer and allows mixed 
case file names to be passed.






-----Original Message-----
From:	Earnie Boyd [SMTP:earnie_boyd AT hotmail DOT com]
Sent:	25 March 1998 12:27
To:	kh AT wg DOT icl DOT co DOT uk
Cc:	gnu-win32 AT cygnus DOT com
Subject:	Re: Cygwin Performance - especially on a network



>From: Kevin Hughes <kh AT wg DOT icl DOT co DOT uk>
>Reply-To: "kh AT wg DOT icl DOT co DOT uk" <kh AT wg DOT icl DOT co DOT uk>
>To: "'Gnuwin95 (E-mail)'" <gnu-win32 AT cygnus DOT com>
>Subject: Cygwin Performance - especially on a network
>Date: Fri, 20 Mar 1998 10:30:34 -0000
>
>
>I  have been very interested in the performance of the cygin toolset
>specifically the apparent slowness of the system primarily on network
>connected disks. This topic (performance) has ocupied a great deal of
the
>list bandwidth from time to time.
>
>I have now managed to get some measures for a  program compiled under
>cygwin and msvc++ accessing local and remote drives. The program is
>trivial, it hangs around to let loading complete and then opens a file
>identified as a parameter, fstats it and then closes it. More than 1
file
>can be specified on the input.
>The program reports the time taken to complete the actions - using the
>rdtsc counter.
>
>This is the results I get running from NT command shell, running the
>program twice to the same files


What version of NT and what filesystem?  cygwin32 responds differently
for FAT vs NTFS.  On FAT there is an "EA DATA. SF" file that gets
written to. 8-(


Have you tried your program using Mingw32 available from Colin Peters
page?  or EGCS available from Mumit Khan's page?

<snip>



-        \\||//
---o0O0--Earnie--0O0o----
-earnie_boyd AT hotmail DOT com-
------ooo0O--O0ooo-------

Check out these great gnu-win32 related sites:
ftp://ftp.cygnus.com/pub/gnu-win32/latest/                  (ftp site)
http://www.cygnus.com/pubs/gnupro/                    (Comercial Page)
http://www.cygnus.com/misc/gnu-win32/                   (Project Page)
http://www.cygnus.com/ml/gnu-win32                     (Mail Archives)
http://www.itribe.net/virtunix/winhelp-man-pages/     (HTML Man Pages)
http://www.lexa.ru/sos                               (Sergey Okhapkin)
ftp://www.lexa.ru/pub/domestic/sos/                (Sergey's ftp site)
http://www.fu.is.saga-u.ac.jp/~colin/gcc.html           (Colin Peters)
http://www.xraylith.wisc.edu/~khan/software/gnu-win32/    (Mumit Khan)
http://gnu-win32.paranoia.ru                   (Chuck Bogorad's ports)
http://www.bestweb.net/~aka/gnu-win32/  (GNU-Win32 Bash Configuration)
http://rcw.home.ml.org/                  (Rob Warner - software ports)
http://www.wenet.net/~garbanzo/gnuwin32/     (more - software portals)
http://www.wenet.net/~garbanzo/gnuwin32/rpm   (Redhat Package Manager)
http://www.parallax.co.uk/~andyp/index_text.html  (Andy Piper - ports)
http://www.tiac.net/users/cgf     (Christopher Faylor - package ports)
ftp://ftp.franken.de/pub/win32/develop/gnuwin32/       (German mirror)

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