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Re: [Discuss-gnuradio] Thread scheduling for high-sensitivity, high-reso
From: |
Eric Blossom |
Subject: |
Re: [Discuss-gnuradio] Thread scheduling for high-sensitivity, high-resolutionFFTs |
Date: |
Tue, 6 Jan 2009 21:38:48 -0800 |
User-agent: |
Mutt/1.5.18 (2008-05-17) |
On Tue, Jan 06, 2009 at 11:20:48PM -0500, Marcus D. Leech wrote:
> Eric Blossom wrote:
> >
> >
> > Is this an SMP machine, or a cluster?
> >
> > If SMP, it'll "just work". If it's a cluster, you'll need to figure
> > out how to partition separate instantiations of GR on each node.
> >
> > Eric
>
> SMP.
>
> Describe how it'll "just work"??
>
> Maybe I haven't looked at all the blocks carefully enough, but I can't
> immediately see how to do this.
>
> I basically want a "distributor" block that distributes FFT input frames
> to multiple instances of an FFT computation,
> across multiple threads, and have the results of the separate FFTs
> synchronized.
Sounds good. Sorry, I misunderstood your goal.
(I'm working on the guts of FFTW now and have FFT on the brain...)
I think we have the blocks you need to do the fanout and fanin
already. They're disguised as
gr.deinterleave(itemsize)
gr.interleave(itemsize)
I think you could use them like this:
fft_size = 512
usrp = ...
fanout = gr.deinterleave(fft_size * gr.sizeof_complex)
fanin = gr.interleave(fft_size * gr.sizeof_complex)
fft0 = ...
fft1 = ...
fft2 = ...
fft3 = ...
connect(usrp, fanout)
connect((fanout, 0), fft0)
connect((fanout, 1), fft1)
connect((fanout, 2), fft2)
connect((fanout, 3), fft3)
connect(fft0, (fanin, 0))
connect(fft1, (fanin, 1))
connect(fft2, (fanin, 2))
connect(fft3, (fanin, 3))
Each block runs in its own thread, so this should run faster on an SMP
machine. Please let us know if this works for you!
[FYI, there are also two extra copies happening in the gr.fft_* block that I
now know how to remove...]
Eric
- [Discuss-gnuradio] Thread scheduling for high-sensitivity, high-resolution FFTs, Marcus D. Leech, 2009/01/06
- Re: [Discuss-gnuradio] Thread scheduling for high-sensitivity, high-resolution FFTs, Eric Blossom, 2009/01/06
- Re: [Discuss-gnuradio] Thread scheduling for high-sensitivity, high-resolutionFFTs, Marcus D. Leech, 2009/01/06
- Re: [Discuss-gnuradio] Thread scheduling for high-sensitivity, high-resolutionFFTs,
Eric Blossom <=
- Re: [Discuss-gnuradio] Thread scheduling for high-sensitivity, high-resolutionFFTs, Marcus D. Leech, 2009/01/07
- RE: [Discuss-gnuradio] Thread scheduling for high-sensitivity, high-resolutionFFTs, Bob McGwier, 2009/01/07
- Re: [Discuss-gnuradio] Thread scheduling for high-sensitivity, high-resolutionFFTs, Marcus D. Leech, 2009/01/07
- RE: [Discuss-gnuradio] Thread scheduling for high-sensitivity, high-resolutionFFTs, Bob McGwier, 2009/01/07
- [Discuss-gnuradio] Object model for stdgui2, Paul Mathews, 2009/01/14
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