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

[Matt Ettus]

On 09/02/2010 07:09 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?

Jack,

I think you are missing the point here.  There is no need to lie to the 
program.  If you are sending the FFT sink 25 MS/s, then tell it you are 
sending it 25 MS/s.  If you give it a different rate you will have all 
sorts of other issues, like incorrect frequency scales on the display. 
If you want to decrease the processor load then reduce the display 
update rate.

If you have unaccelerated OpenGL, then the OpenGL version will be 
unacceptably slow.

Matt