Mailing-List:	contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Subscribe:	<mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive:	<http://sourceware.org/ml/cygwin/>
List-Post:	<mailto:cygwin AT cygwin DOT com>
List-Help:	<mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs>
Sender:	cygwin-owner AT cygwin DOT com
Mail-Followup-To:	cygwin AT cygwin DOT com
Delivered-To:	mailing list cygwin AT cygwin DOT com
X-Authentication-Warning:	slinky.cs.nyu.edu: pechtcha owned process doing -bs
Date:	Fri, 4 Jun 2004 14:17:20 -0400 (EDT)
From:	Igor Pechtchanski <pechtcha AT cs DOT nyu DOT edu>
Reply-To:	cygwin AT cygwin DOT com
To:	Hannu E K Nevalainen <garbage_collector AT telia DOT com>
cc:	cygwin AT cygwin DOT com
Subject:	RE: cygwin gcc performance
In-Reply-To:	<NGBBLLIAMFLGJEOAJCCEEEEADLAA.garbage_collector@telia.com>
Message-ID:	<Pine.GSO.4.58.0406041414180.2262@slinky.cs.nyu.edu>
References:	<NGBBLLIAMFLGJEOAJCCEEEEADLAA DOT garbage_collector AT telia DOT com>
MIME-Version:	1.0
X-Scanned-By:	MIMEDefang 2.39

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 AT cs DOT nyu DOT edu
ZZZzz /,`.-'`'    -.  ;-;;,_		igor AT watson DOT ibm DOT 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/

- Raw text -