Mail Archives: cygwin/2003/11/16/09:55:04
Hello. Until recently I was running W2k with an ancient version of
cygwin; I don't know what version it was, but if anybody cares I've
put a copy of cygwin1.dll (dated 2001-May-20) at
http://www.cs.toronto.edu/~wayne/tmp/cygwin1-old.dll.gz
It worked fine on W2k for the past 2.5 years.
I recently upgraded to Windows XP and this old cygwin stopped working.
No problem, I say, it's also time to upgrade cygwin, so I go install the
most recent version.
Everything works fine, except one of my I/O intensive simulations starts
running about 20 times slower!
After copious mucking about, I finally narrowed it down to sscanf: sscanf
on double precisions numbers, such as
double a;
char line [80];
fgets(line...)
sscanf(line, "%lf", &a);
runs about 20 times slower than in the old cygwin. Replacing the sscanf
with a call to atof gets back the old speed. It's only noticable, of
course, if you're scanning a huge file. In my case, it's a 60MB file
that contains tens of thousands of lines of ASCII floating point numbers.
So, consider this a bug report. A slowdown of a factor of 20 is not really
a good thing.
The output of "cygcheck -s -v -r > cygcheck.out" can be found at
http://www.cs.toronto.edu/~wayne/tmp/cygcheck-XP-1.5.5.out.gz
Thanks!
- Wayne
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