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

[Martin Dvh]

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 
patterns.

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.


Greetings,
Martin

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