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From: Mike Marchywka <marchywka AT hotmail DOT com>
To: w1hkj <w1hkj AT w1hkj DOT com>, <cygwin AT cygwin DOT com>
Subject: RE: Performance question/ amateur radio DSP
Date: Mon, 7 Apr 2008 10:05:20 -0400
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As a former radio amateur with some DSP interest, 

> We would appreciate any assistance or suggestions on how to improve the
> performance when linking to cygwin1.dll.

I would suggest building with the profiler and finding some suspects. These can be non-obvious
and easy to fix once identified.

IIRC, the profiler is "gprof"

In the past, after blaming my numerical code, I have found string processing or IO bottlenecks.
It may not even be your code per se as incidental screen updates could be using all the time.
Even if someone on list can identify a known reason for the specific symptom you report,
you may want to run the profiler in the two cases anyway.


Mike Marchywka
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ISP - try  me on marchywka AT yahoo DOT com if no reply
here. Thanks.


> Date: Mon, 7 Apr 2008 08:35:52 -0500
> From: w1hkj AT w1hkj DOT com
> To: cygwin AT cygwin DOT com
> Subject: Performance question
>
> We are porting a real time data acquisition program for amateur radio
> digital signal processing. The program, fldigi, uses the Fast Light
> Tool Kit and and a number of support libraries including PortAudio and
> Sndfile. The source code for this program can be found at
> http://www.w1hkj.com. fldigi is licensed under the GPL.
>
> The port to Windows using Cygwin works very well. There is just one
> issue that needs to be addressed. Several test platforms are used to
> gauge performance, including an
>
> HP notebook, 900 Mhz Athalon, 256 Mg RAM, and
> Dell Dimension 3000, dual processor 3.0 GHz, 1 G RAM.
>
> There is is very significant difference in cpu usage between running the
> application from the Cygwin X-terminal and running from the run command
> (with the cygwin1.dll) from Windows.
>
> System X-term Windows-Run
> HP Athalon 33% 100%
> Dell 3000 3 % 55%
>
>
> We would appreciate any assistance or suggestions on how to improve the
> performance when linking to cygwin1.dll.
>
> Thank you.
>
> David Freese
> for fldigi development team.
>
>
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