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[Discuss-gnuradio] Tesla C2000 series and CUDA and Gnu Radio

From: Marcus D. Leech
Subject: [Discuss-gnuradio] Tesla C2000 series and CUDA and Gnu Radio
Date: Wed, 01 Dec 2010 01:40:03 -0500
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Is anyone out there taking another look at CUDA + Gnu Radio?

Some of the couple-of-years-old charts I've looked at suggest that
speedups for some of the
  most important transforms we use vary between modest and disappointing.

Cross-over points for things like FFTs are usually up in the atmospheric
levels of FFT sizes before
  a CUDA-based transform would win even slightly against a
multi-threaded CPU-based FFTW, for
  example.  But that was a couple of years ago.  Anything new along
those lines?

It seems like the kinds of things that do well on a GPU are ones that
take a small amount of input
  data, compute ferociously, and produce modest amounts of output data. 
Or schemes that might
  consume deluges of input data, but produce output data only
occasionally--a flow that did
  a bunch of FFTs and produced averaged mag-squared outputs only "once
in a while" might fare
  well on a GPU.

On a related note, has anyone looked at enabling the multi-threaded FFTW
stuff?  The cross-over
  points there (between FFTW in a single-thread and FFTW in
multiple-threads) seem to be lower-down
  on the FFT-size curve.

Principal Investigator
Shirleys Bay Radio Astronomy Consortium

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