Message-ID:	<3561B91D.702A@epfl.ch>
Date:	Tue, 19 May 1998 18:53:49 +0200
From:	Lionel Portmann <Lionel DOT Portmann AT epfl DOT ch>
Reply-To:	Lionel DOT Portmann AT epfl DOT ch
MIME-Version:	1.0
Newsgroups:	comp.os.msdos.djgpp
Subject:	DJGPP vs. mingwin32 I/O performances
NNTP-Posting-Host:	legpc56.epfl.ch
Organization:	EPFL
Lines:	19
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

It is likely that this kind of question was already posted, but I
couln'd find anything in the existing news.

I wish to use gcc on a PC in order to do some I/O intensive work
(parsing big ASCII files). The program will only produce displays in a
console.

I tried both ports of gcc v2.8.1 for PC, DJGPP and MINGWIN32.
I compiled the very same source code with both environnement,
and found that the mingwin32 executable was a least 1.5 times slower 
than djgpp one. I read in a FAQ that djgpp has to switch between
protected mode and real mode every time it has to do I/O access,
so I expected mingwin32 to be faster than djgpp. 

I have to add that at compilation time, mingwin32 gave me more warnings
than djgpp, which might indicate that the settings are not equivalent.
On the other hand, -O3 switch was ON in both versions. 

Any hint?

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