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Re: [Discuss-gnuradio] using gpu's for accelerating computations

From: Martin Dvh
Subject: Re: [Discuss-gnuradio] using gpu's for accelerating computations
Date: Fri, 15 Jun 2007 19:48:38 +0200
User-agent: Debian Thunderbird 1.0.2 (X11/20070113)

Daniel O'Connor wrote:
> On Friday 15 June 2007 04:52, Rohit Garg wrote:
>>Has any body tried porting the compute intensive portions to GPU's.
>>The task apparantly is ideal for GPU's to digest. I know that GPGPU
>>is, as yet, more research and less apps area, but I feel that it will
>>be valuable addition.
Yes I have done so a whila ago.

I ported some FIR filters to the GPU.
The results were somewhat promising but not very good.
I got about 500 Mtaps/sec on a nvidia 5700LE after tuning the memory access 

memory bandwidth and AGP/PCI-E bandwidth are the main issues.

Another issue is that gnuradio data is 1-dimensional.
GPU's do very well in 2-dimensional data but you have to jump a lot of 
loopholes to get 1-dimensional data to work en perform well.
(The cache in a GPU is also 2-dimensional)

With nvidia CUDA and/or ATI CTM and recent hardware results should probably be 
much better for FIR filters and things like that.

Blocks that work with a loopback (like IIR, PLLs) will never work well on a GPU 
because you cannot parralellize the algorithm.


> http://www.google.com/search?q=gnuradio+gpu&ie=UTF-8&oe=UTF-8
> :)
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