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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>
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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
-- 
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