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Re: higher-level IO very slow with cygwin1.dll 5.10 (due to set_flags?)
At 11:42 PM 6/22/2004, you wrote
>On Tue, Jun 22, 2004 at 11:14:17PM -0400, sevenrider@express56.com wrote:
>>I am just asking again about this problem in the hopes that someone
>>might have anything to suggest. It seems that fopen is 10 to 20 times
>>slower than open on my I/O operations due to large delays in executing
>>a system call "set_flags". I will have to rewrite all my code and
>>abandon most of the text utility programs like "grep" and "sort" unless
>>I can figure out what is going on.
>
>Seems like if you are going to go to the effort of rewriting everything
>you might first want to debug cygwin and find out where the time is
>going...
Dag-namit! CGF beat me to the punch. :-) I would only add
that there are two "set_flag" routines. One in path.cc, the
other in fhandler.h/fhandler.cc. They don't do allot. Just
setting flags really (who would have guessed? ;-) ) and no one
has fiddled with these in the 1.5.10 time-frame. It's hard to
imagine that either of these routines are what's responsible
for all the time you see lost.
CGF is right (who would have guessed! ;-) ). Debugging the
internals a little bit would be time well spent, especially
given the alternative you describe.
--
Larry Hall http://www.rfk.com
RFK Partners, Inc. (508) 893-9779 - RFK Office
838 Washington Street (508) 893-9889 - FAX
Holliston, MA 01746
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