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Date:	Sat, 28 May 2005 17:18:44 -0400
From:	Christopher Faylor <cgf-no-personal-reply-please AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: Serious performance problems (malloc related?)
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On Sat, May 28, 2005 at 10:51:01PM +0200, Vaclav Haisman wrote:
>On Sat, 28 May 2005, Gerrit P. Haase wrote:
>
>> Andy Ross wrote:
>> > But as I noted in my original post: It's not waiting on the disk
>> > reads.  Comment out the split() call and watch the delays disappear.
>> > Raw I/O speed in cygwin is comparable to mingw or MSVC.  The overhead
>> > is due, somehow, to activity within/under split().  Other than
>> > allocation, that function doesn't do any meaningful library
>> > interaction that I can see (although Vaclav's suggestion about
>> > exception handling is a very good one...).
>>
>> Can you port the testcase you provided to C to see if it makes a
>> difference, please?
>
>Or maybe at least try -fno-exceptions...

I tried every variation of g++ exception switches that I could think of.
It didn't make a difference.

On further investigation, it sounds like the exception stuff is a red
herring.  It seems to have something to do with the fact that cygwin
uses pthread_* and, apparently, pthread* is slow.  It may be that cygwin
calls in general are slow...

cgf

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