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Re: Performance problem

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 <>.  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
<> if that's the case.


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...
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


for more details.

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