sorting using radix sort

[sash]

hi

I was sorting a large number of elements (around 16M) and got
timings of about 125 ms. Then I tried sorting exactly 16M numbers and
still the time taken is around 120ms. Is it too high? I was checking
the paper by Harris et. al. and the timings are around 90 ms. Am I
going wrong anywhere? I tried it on both radix sorts - the one in
cudpp 1.1 and the one in the cuda sdk of 2.3

thanks

s

[Mark Harris]

Please provide information on your system.  GPU, OS, CUDA version, etc.

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[Peter Volk]

Hi,

it also depends on what CPU and GPU you have. The GPUs have different
clockings (e.g. gtx285 has a faster clocking than the gtx295 but fewer
SMs).

Cheers,
Peter

[sash]

hi

sorry for not mentioning there itself. I'm using ubuntu 9.04
with cuda 2.3 and cudpp 1.1. My GPU is gtx 280.

thanks

s

On Nov 26, 1:32 pm, Peter Volk <volk.pe...@googlemail.com> wrote:
> Hi,
>
> it also depends on what CPU and GPU you have. The GPUs have different
> clockings (e.g. gtx285 has a faster clocking than the gtx295 but fewer
> SMs).
>
> Cheers,
> Peter
>

[Mark Harris]

32-bit or 64-bit?  

My guess is the OS is the major difference.  The numbers in the paper are from WinXP 32-bit, which I find to generally have the fastest CUDA performance of the OSes (definitely compared to WinVista).

Mark

[sash]

i'm using 32 bit linux. Thanks a lot for that info. I started CUDA in
linux and have been stuck with it ever since. Now, this is a good
enough reason to try windows XP as well! :)

On Nov 26, 5:02 pm, Mark Harris <harr...@gmail.com> wrote:
> 32-bit or 64-bit?
>
> My guess is the OS is the major difference.  The numbers in the paper are
> from WinXP 32-bit, which I find to generally have the fastest CUDA
> performance of the OSes (definitely compared to WinVista).
>
> Mark
>

> > cudpp+un...@googlegroups.com <cudpp%2Bunsu...@googlegroups.com>.

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>

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