Mail Archives: cygwin/2007/12/10/08:28:30
On Dec 10 10:57, Corinna Vinschen wrote:
> On Dec 9 10:49, Jim Reisert AD1C wrote:
> > I have a number of data processing programs written in C in the Cygwin
> > environment. They read data files into linked lists, analyze the data
> > and write results back out to disk.
> >
> > This new release of Cygwin is about 10x slower than 1.5.24-2, after
> > recompiling the programs. I went back to the older Cygwin release and
> > normal speed was restored.
>
> Well, 10x sounds rather bad.
I can't reproduce worse I/O performance. I tested different scenarios
with lots of disc I/O and the performance was identical between 1.5.24
and 1.5.25 within the bounds of a performance test.
In some cases applications are even getting faster under 1.5.25, for
instance cat(1) from coreutils. This is likely due to the fact that
the st_blksize member in struct stat now returns 65536 (apparently the
preferred I/O blocksize in Windows). This should also positively affect
the stdio functions like fread/fwrite.
Given the above, we really need a simple, self-contained testcase,
as I asked for in my previous mail on the subject.
Corinna
--
Corinna Vinschen Please, send mails regarding Cygwin to
Cygwin Project Co-Leader cygwin AT cygwin DOT com
Red Hat
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