Mailing-List: contact cygwin-help@sourceware.cygnus.com; run by ezmlm List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner@sources.redhat.com Delivered-To: mailing list cygwin@sources.redhat.com Message-ID: <17B78BDF120BD411B70100500422FC6309E1FF@IIS000> From: Bernard Dautrevaux To: "'cygwin@cygwin.com'" Subject: RE: Optimizing away "ReadFile" calls when Make calls stat() Date: Wed, 14 Feb 2001 11:42:37 +0100 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2650.21) Content-Type: text/plain; charset="iso-8859-1" > -----Original Message----- > From: Christopher Faylor [mailto:cgf@redhat.com] > Sent: Tuesday, February 13, 2001 11:29 PM > To: cygwin@cygwin.com > Subject: Re: Optimizing away "ReadFile" calls when Make calls stat() > > > On Tue, Feb 13, 2001 at 05:13:49PM -0500, Puttkammer, Roman wrote: > > > >> -----Original Message----- > >> From: jfaith@lineo.com [mailto:jfaith@lineo.com] > >> ... > >> script just did "make --version > /dev/null" one thousand times > >> ... > >> Linux: 3 sec. > >> VMWare running Linux: 9 sec. > >> DOS (batch file) 18 sec. > >> Cygwin: 30 sec. > > > >AFAIK, fork() tends to be much slower on windows than on most unixes > >such as solaris or linux. > > There is no real fork on generic Win32. Cygwin emulates the > fork call and > it is, as a result, very slow. > AFAIK, cygwin is not the only at fault here, the raw Win32 CreateProcess() call is quite slow also. In our cross-development toolset we only use a "spawn" call implemented directly on top of ProcessCreate and we see a more than 10-times performance loss between "fork/exec" on Linux and "spawn" on NT :-) Regards, Bernard -------------------------------------------- Bernard Dautrevaux Microprocess Ingenierie 97 bis, rue de Colombes 92400 COURBEVOIE FRANCE Tel: +33 (0) 1 47 68 80 80 Fax: +33 (0) 1 47 88 97 85 e-mail: dautrevaux@microprocess.com b.dautrevaux@usa.net -------------------------------------------- -- Want to unsubscribe from this list? Check out: http://cygwin.com/ml/#unsubscribe-simple