Forum > GPU crunching

[Split] PowerSpectrum Unit Test

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Jason G:
As a side effect, I'm accumulating a good collection of data that tells me a lot about the different GPU memory subsystems, on different generations (Powerspectrum is a 'memory bound' computation).  Will split this off into its own thread a bit later [Done]

[Edit] In our own thread now, feel free to post results here,  attach, or PM.  I'm getting some very handy information to use this weekend, toward optimisation strategies.

Will try and make some sort of table up once I make some sense of the data.

Frizz:
Device: GeForce GT 240, 1340 MHz clock, 512 MB memory.
Compiled with CUDA 3020.
Stock GetPowerSpectrum():
     64 threads:       10.1 GFlops    4.0 GB/s 1183.3ulps


GetPowerSpectrum() mod 1:
     32 threads:        8.6 GFlops    3.4 GB/s 1183.3ulps
     64 threads:       10.1 GFlops    4.1 GB/s 1183.3ulps
    128 threads:       10.1 GFlops    4.0 GB/s 1183.3ulps
    256 threads:       10.1 GFlops    4.0 GB/s 1183.3ulps


GetPowerSpectrum() mod 2:
     32 threads:        3.4 GFlops    1.3 GB/s 1183.3ulps
     64 threads:        4.5 GFlops    1.8 GB/s 1183.3ulps
    128 threads:        4.5 GFlops    1.8 GB/s 1183.3ulps
    256 threads:        4.4 GFlops    1.8 GB/s 1183.3ulps

Richard Haselgrove:
A couple more datapoints, from Windows 7. The 'AMP' in the card model name says it's a factory overclock version.

Jason G:
Thanks both.  Those are the 'stubborn' cards  ;)

Frizz:
I can't speak for Richard but my card is as stubborn as I am  ;D

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