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Date: Thu, 19 Jun 2003 22:17:54 -0400
From: Christopher Faylor <cgf AT redhat DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: stderr outputs veerrrryyy slowly
Message-ID: <20030620021754.GA19653@redhat.com>
Reply-To: cygwin AT cygwin DOT com
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References: <3EF099C8 DOT 8FDEC855 AT dessent DOT net> <3EF09ED6 DOT F4943C46 AT dessent DOT net> <3EF0B792 DOT 40204 AT cygwin DOT com> <3EF0BFA2 DOT 99CCC92A AT dessent DOT net> <3EF26B27 DOT 1020203 AT cygwin DOT com> <20030620021155 DOT GA19483 AT redhat DOT com>
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On Thu, Jun 19, 2003 at 10:11:55PM -0400, Christopher Faylor wrote:
>On Thu, Jun 19, 2003 at 10:02:15PM -0400, Larry Hall wrote:
>>Brian Dessent wrote:
>>>Larry Hall wrote:
>>>>Works for me fine either way.  Perhaps providing information
>>>>requested by <http://cygwin.com/problems.html> will shed some light.
>>>>Perhaps not.
>>>>
>>>>You could try it with strace and post the results too.
>>>
>>>Ok, attached should be the cygcheck -srv output.  Also, the strace log
>>>for running "tidy" on a html file is at
>>><http://www.dessent.net/tmp/strace.txt>  It's pretty big, about 17000
>>>lines.  Of interest are two things:
>>>
>>>Running it under strace fixes the problem (!!) more or less.  The output
>>>is much faster, although not quite as fast as you would expect for
>>>console output:
>>>
>>>time strace -o strace.out tidy -o foo test.html
>>>...
>>>real    0m4.640s
>>>user    0m0.010s
>>>sys     0m0.020s
>>>
>>>time tidy -o foo test.html
>>>...
>>>real    0m39.301s
>>>user    0m0.070s
>>>sys     0m0.020s
>>
>>OK, I have been able to reproduce this to some extent.  I'm using 'curl
>>-o /dev/null http://www.google.com' which times in at about 1.5 to 2
>>seconds with 'tty' and about .5 seconds without.  I don't have any
>>additional data at this point but I thought I'd "chime in" with a "me
>>too", since I know that's what this list is all about.  ;-) Actually, I
>>wanted to let Brian and any others know that this doesn't appear to be
>>specific to their configuration.  If I find out more, I'll report back.
>
>This crops up on the cygwin list from time to time.
>
>IIRC, if you use 'setbuf(f, NULL)' in newlib (as is the case for
                                    from
>stderr), it causes newlib to flush on every character.  I submitted a
>patch to fix this behavior many years ago but it was rejected.  I think
>the rationale was basically a "This isn't broken.  We're allowed to do
>this" but I don't really recall exactly why the patch was rejected.

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