On Sat, May 28, 2005 at 01:24:31PM +0200, Vaclav Haisman wrote: >Somebody mentioned that malloc implementation could be the problem. Dunno. I >has also crossed my mind that another difference between FreeBSD and Cygwin is >implementation of C++ exceptions. Maybe the SJLJ implementation that Cygwin >AFAIK uses has too big overhead.
To test this theory, I just tried replacing Cygwin's "Unwind" functions with those from mingw and saw a noticeable speed up in the execution of this program. I did this by extracting the contents of mingw's libgcc to a directory and then including unwind-c.o and unwind-sjlj.o on the command line when linking the test case. I had to modify the test case by adding these two lines to the bottom: int __mingwthr_key_dtor; int _CRT_MT; to avoid undefined symbol errors so this is obviously not intended as a complete solution. On doing this, the program went from taking 25 seconds to execute to taking 7 seconds to execute. That's still 4x slower than mingw but it is, nonetheless, a noticeable difference. Gerrit and Danny do you know what the difference between the mingw and cygwin implementations of these functions might be? cgf -- 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/
