On 05/06/2010 11:01 PM, Eric Blossom wrote: > > The cgran version shows the speedup pretty well, but you need to be > using big FFTs to see the win, where big >= 4096 points. > > I laugh heartily at your puny FFTs of only 4096 points :-)
I regularly do FFTs with 1Hz resolution over bandwidths of several MHz with Gnu Radio. They run in "real time" on a reasonably-snappy "normal" CPU. But I guess I could be doing them on a GPU at some point :-) Something that requires big crunchies in my application space is coherent de-dispersion, which requires the construction of a (usually largish) complex FFT filter. Seems that might benefit from GPU speedup. Right now, I have to decide whether I want an RFI filter (an FFT notch filter basically, and it doesn't have to be all that long), or a de-dispersion filter (generally much longer). But oh boy, can I have both, please? :-) Actually, I'm probably going to start playing with a Phenom II X6 1090T some time this summer, and I may get back enough crunchies to do both coherent de-dispersion and RFI notch filtering in real time. Yay! -- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
