Re: [Discuss-gnuradio] WX GUI FFT Sink Performance

[Hilbert Transform]

One of the beauties of open-source software is that if you don't like the way something works, or think it should be

  enhanced, you can take care of that yourself, and, hopefully, share the results with the community.

If you don't have the necessary skils to do so, then you make your desires known, and hope that the developers

  will, at some point, consider your needs, and decide whether it's worth implementing them, and putting said
  implementation on the schedule.

I think Marcus had previously stated that the GUI elements in Gnu Radio itself were primarily designed as an aid
  to instrumenting and debugging flow-graphs, and that only secondarily are they useful for building real applications.

It would be useful for Tom to chime in here about the features of the QtGUI stuff in "next".  Nobody is actively

  working to make the wxGUI side of things "lovely" at this point, because energy is going into, as far as I know,

  the QtGUI side.

On Thu, May 16, 2013 at 1:36 PM, Mark McCarron <address@hidden> wrote:

Marcus,

Accurate output is great when doing analysis, but if you just want to create a quick interface that will allow you to see a little more detail, then overlapping or duplicating the stream is fine.  The error in the output is always within a given tolerance and that can be suitable for a lot of applications.  By no means am I suggesting to eliminate the accurate GUI elements, just that an alternative should be offered.

I tested your sample and that works fine on my machine.  I have updated it to a refresh rate of 30 and this is when it becomes unresponsive.  I ran perfmon and the resources seem fine, but I do see a massive spike in page faults and transition faults when executing a flow graph.  That, in itself may not be an issues, but I have checked all the usual bottlenecks and they are barely being touched.  I'm running the latest Windows build of this on a quad core Win2012 server with 16GB ram. 

It seems like a bug in the build.

Regards,

Mark McCarron

---

Date: Thu, 16 May 2013 13:02:09 -0400
From: address@hidden
To: address@hidden

Subject: Re: [Discuss-gnuradio] WX GUI FFT Sink Performance

On 05/16/2013 12:41 PM, Mark McCarron wrote:

Marcus,

Thanks for highlighting the limitations of the current implementation.  It explains a lot.  Personally, I would like to see a little more emphasis on useful GUI elements, not just accurate GUI elements. 

So, you'd rather see fast updates of near-complete-nonsense, than slow updates of accurate data?  :) :)

In regards to the WX GUI FFT window not responding.  I have tested it with a very simple flow-graph.  A USRP source and the WX FFT GUI block.  If the settings are at address@hidden, it works fine, try anything higher and the windows greys out.  So, I don't really see where the issue is.

Works for me with the latest Gnu Radio on F14.

You may just be running out of computational steam in Python land, since the wxGUI FFT sink does waaaay too much of its "stuff" in Python land.
  Python runs up to about 100 times slower than equivalent native code.

I've attached a simple test that works just fine here.

-- 
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org

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