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" To: "'Earnie Boyd'" Cc: "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 >Reply-To: "kh AT wg DOT icl DOT co DOT uk" >To: "'Gnuwin95 (E-mail)'" >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? - \\||// ---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) SEARCH ENGINES WITH gnu-win32 mail archive RELATED INDICIES: http://www.progressive-comp.com/Lists/?l=gnu-win32&r=1&w=2#gnu-win32 http://www.findmail.com http://www.search.com add gnu-win32 or gnuwin32 to the search criteria. Help for Win32 Beginners: http://www.relisoft.com ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com - For help on using this list (especially unsubscribing), send a message to "gnu-win32-request AT cygnus DOT com" with one line of text: "help".