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Message-ID: <40D353CA.7010905@dynetics.com>
Date: Fri, 18 Jun 2004 15:42:50 -0500
From: "Douglas A. Vechinski" <douglas DOT vechinski AT dynetics DOT com>
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To: cygwin AT cygwin DOT com
Subject: Re: Poor execution speeds using -mno-cygwin g77 option
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Igor Pechtchanski wrote:

>>Even though Case C, when the -mno-cygwin flag is not used, the
>>difference is still significant. compared to Case A.
>>    
>>
>
>That's not surprising.  Cygwin is a POSIX emulation environment *on top*
>of Windows -- naturally the performance of any Cygwin tool will be slower
>than that of an equivalent pure Windows tool.  The MinGW case is
>surprising, but doesn't belong on this list.
>  
>
I was planning on sending the question to Mingw32.  I never have been 
totally clear on how separate and distinct Cygwin and Mingw32 are.

>>Is this a Cygwin problem, or g77 problem or something else.  I don't
>>recall experiencing such differences several years ago when doing the
>>same thing.
>>    
>>
>
>Things evolve.  It's possible that some system calls got speeded up on
>Linux (or, though doubtful, that some system calls got slowed down on
>Windows).  Are you using the same exact options to compile (keep in mind
>that the defaults may be different on Linux and Cygwin)?  As a WAG, are
>you using floating point emulation instead of hardware?
>
I supply the same compiler flags to both under Linux and Cygwin (-O and 
some -D defines).  To my knowledge, I'm not using floating point 
emulation.  But if I was, how would I be able to check?


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