From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 4660 invoked by alias); 4 Jun 2004 18:17:21 -0000 Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm Precedence: bulk List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner@cygwin.com Mail-Followup-To: cygwin@cygwin.com Received: (qmail 4642 invoked from network); 4 Jun 2004 18:17:21 -0000 Received: from unknown (HELO slinky.cs.nyu.edu) (128.122.20.14) by sourceware.org with SMTP; 4 Jun 2004 18:17:21 -0000 Received: from slinky.cs.nyu.edu (localhost [127.0.0.1]) by slinky.cs.nyu.edu (8.12.10+Sun/8.12.10) with ESMTP id i54IHKVZ007055; Fri, 4 Jun 2004 14:17:20 -0400 (EDT) Received: from localhost (pechtcha@localhost) by slinky.cs.nyu.edu (8.12.10+Sun/8.12.2/Submit) with ESMTP id i54IHKiL007052; Fri, 4 Jun 2004 14:17:20 -0400 (EDT) X-Authentication-Warning: slinky.cs.nyu.edu: pechtcha owned process doing -bs Date: Fri, 04 Jun 2004 18:17:00 -0000 From: Igor Pechtchanski Reply-To: cygwin@cygwin.com To: Hannu E K Nevalainen cc: cygwin@cygwin.com Subject: RE: cygwin gcc performance In-Reply-To: Message-ID: References: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Scanned-By: MIMEDefang 2.39 X-SW-Source: 2004-06/txt/msg00194.txt.bz2 On Fri, 4 Jun 2004, Hannu E K Nevalainen wrote: > > From: Igor Pechtchanski > > Sent: Friday, June 04, 2004 6:08 PM > > > On Fri, 4 Jun 2004, Matthieu VIAL wrote: > > > > > Hello, > > > > > > Could someone explain me why gcc cygwin compiler take so long to build a > > > simple hello world program compared with mingw ? > > > > Cygwin is a POSIX emulation layer. Using the POSIX emulation is bound to > > be less efficient than running the native application (which is what the > > MinGW gcc is). If you want to know wher ethe time's going, look at the > > strace output (don't send it to the list, though, as your times look quite > > normal -- I get about 1.6s on my system once gcc is in the disk cache). > > Well, then it might also depend a bit on HOW you launch mingw-gcc; > Matthieu had a strange way to do it. > > $ time gcc -mno-cygwin -o hw hw.c; \ > time gcc -o hw hw.c > real 0m2.133s > user 0m0.530s > sys 0m1.590s > > real 0m1.932s > user 0m0.530s > sys 0m1.410s > > This is in my P2/450... FWIW - just my 0.2 seconds. FYI, the above didn't run the MinGW gcc -- it ran the Cygwin gcc with a MinGW target. The difference is that the MinGW gcc is a Windows native application, whereas Cygwin's gcc, even with -mno-cygwin, uses the POSIX layer (even if the applications produced by it don't). Igor -- http://cs.nyu.edu/~pechtcha/ |\ _,,,---,,_ pechtcha@cs.nyu.edu ZZZzz /,`.-'`' -. ;-;;,_ igor@watson.ibm.com |,4- ) )-,_. ,\ ( `'-' Igor Pechtchanski, Ph.D. '---''(_/--' `-'\_) fL a.k.a JaguaR-R-R-r-r-r-.-.-. Meow! "I have since come to realize that being between your mentor and his route to the bathroom is a major career booster." -- Patrick Naughton -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/