Re: [Discuss-gnuradio] GRC's graphical sinks performance issues

[Marcus D. Leech]

On 09/02/2010 10:09 AM, Jack Ott wrote:
> The strange thing is that when the fft's sample rate is at 25Msps which
> equals the USRP's bandwidth at a decimation of 4 everything works fine with
> the regular fft sink yet not with the OpenGL one. However when I increase
> the fft's sample rate to 50Msps which is 2x the USRP's bandwidth both sinks
> work fine. What does this mean?
>
> I'm really convinced all this is because graphics are rendered strictly
> through software. Does GRC even support graphics hardware acceleration? how
> do I configure it?
>   
The application has very little control over such things.

The X server implementation is responsible for dealing with hardware
acceleration, I think via
  something called the "Direct Rendering Manager".  OpenGL will take
advantage of that, if
  it's an available option in your X server.

I'd try changing the update rate in your FFT window--change the "Refresh
Rate" parameter in your
  FFT window from the default of "30" to 5 and see if that makes a
difference.  I'm betting that it
  will.



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