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Strange behaviour with different vector sizes

Question asked by abeamud on Feb 22, 2013
Latest reply on Feb 25, 2013 by nou

Hi all:

I'm using pyopencl 2012.1 with a Radeon HD 6450 with the drivers included in ubuntu 12.04 (fglrx_8.960).

With the attached python script (is a test only), the GPU give me a poor performane (40x slowness) only changing two elements in the vector size...

 

Time for ASIZE: 29120 [GPU]: 0.296946 s

Time for ASIZE: 29120 [CPU]: 0.354775 s

Time for ASIZE: 29122 [GPU]: 11.4285 s

Time for ASIZE: 29122 [CPU]: 0.429958 s

 

It's a problem with my graphic card?

 

Thanks

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