Re: Performance problem

[Larry Hall <cygwin-lh at cygwin dot com>]

Some amount of benchmarking has been done.  You can see the email archives
for reports from various interested folks with their comparisons.  If you
haven't already, visit <http://cygwin.com/faq.html>.  The FAQ covers some
common issues that may affect your results.  However, it sounds to me from
the general information you've provided that you're seeing 'normal
operation'.  Several times slower than Linux is not beyond expectations.
Again, I point out that this doesn't mean there isn't the possibility of
improvement.  If you feel that there is actually a specific issue here,
please feel free to report it as such.  See
<http://cygwin.com/problems.html> if that's the case.

Larry

Vladimir Baltchev wrote:

> Thanks Larry,
> I know about the license. About the speed - it's several times slower... 
> May be it worth the effort to make some benchmarking...
> Vlad
> Larry Hall wrote:
>
> > Vladimir Baltchev wrote:
> >
> > > Hi there,
> > > We are about to port Unix - Irix and Linux applications to Windows 
> > > using Cygwin. However the Cygwin version is very slow compared to 
> > > Linux, even I compiled with the optimize option -O2. It is a Windows 
> > > 2000, the program is a segmentation editor using Qt, OpenGl and some 
> > > image processing.
> > > What is the reason? Is it OpenGL on cygwin, or both?
> >
> >
> >
> >
> > You'd need to do some performance testing to figure out specifically
> > where the bottleneck is for your applications.  However, as you must
> > be aware, Cygwin is a POSIX emulation layer.  It's simply going to be
> > slower than non-emulated environments and native environments.  That
> > said, you'll certainly be able to find performance issues in Cygwin
> > that can be addressed to make it faster.  We'd welcome efforts in
> > this area.  Also, keep in mind that Cygwin is under the GPL license.
> > This means your applications' licenses would need to conform to the
> > open source model if you plan to distribute it.  Otherwise, you need
> > to get a "buy out" license from Red Hat.  See
> >
> > <http://cygwin.com/licensing.html>
> >
> > for more details.





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