Re: [Discuss-gnuradio] saturation with multi_fft.py

[ematlis]

Thanks!

eric

************************************
Eric H. Matlis, Ph.D.
Aerospace & Mechanical Engineering Dept.
120 Hessert Center for Aerospace Research
University of Notre Dame
Notre Dame, IN 46556-5684
Phone: (574) 631-6054
Fax:   (574) 631-8355

On Thu, 11 Oct 2007, Martin Dvh wrote:

> address@hidden wrote:
> > I'm sure you are right about the gui taking the majority of the cycles,
> > but it's the real-time feedback that makes gnuradio so attractive.
> > Ideally one would beable to switch them on and off as needed during
> > operation of the program, which it is my understanding will be possible
> > with the implementation of mblocks.
> >
> > As things stand now, is there a "refresh rate" control that I can
> > modify, so that the scope sinks use less cycles?
> Yes, you can set the following parameters.
> sink    param           default         less cycles     Function
> oscope  frame_decim     1               >1           keep one block in every 
> "frame_decim"
> fft     fft_rate        15.0            <15.0                refresh rate of 
> fft_display
>
> so for less GUI cycles set frame_decim to 10 or even 100
> set fft_rate to 5.0 or even 1.0
>
> I wished that fft_rate was set to 5.0 default because allmost allways 15.0 is 
> too much a load on my machines.
>
> Greetings,
> Martin
>
>
> > thanks,
> > eric
> >
> > On Wed, 10 Oct 2007, Eric Blossom wrote:
> >
> > > On Wed, Oct 10, 2007 at 06:07:04PM -0400, address@hidden wrote:
> > > > Ok, that works in principle, but I'm finding that I cannot sustain the
> > > > same data rate as before on a fast dual core machine.
> > > >
> > > > I'm acquiring all 4 channels, and I'm doing both low-pass and high-pass
> > > > filtering on all of them.  I am also displaying 5 sinks
> > > > simultaneously; 1
> > > > fft and 4 scopes.
> > >
> > > You'll most likely find that the bulk of your cycles are spent in the
> > > gui.  Try disabling it.
> > >
> > > > So, in the long term it would help to have this sorted out in the
> > > > fpga if
> > > > that's possible; is that impossible as things stand now, or is there
> > > > sufficient space in the 4rx no hb fpga?
> > >
> > > IIRC, the std_4rx_0tx.rbf configuration uses about 86% of the FPGA.
> > >
> > > Eric
> >
> >
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