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Re: [Discuss-gnuradio] How to set up MP-Benchmark Test PowerPC Processor
From: |
Marcus D. Leech |
Subject: |
Re: [Discuss-gnuradio] How to set up MP-Benchmark Test PowerPC Processors (using Altivec) |
Date: |
Thu, 06 May 2010 23:12:24 -0400 |
User-agent: |
Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.9) Gecko/20100330 Fedora/3.0.4-1.fc12 Thunderbird/3.0.4 |
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