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 mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
