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 -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
