better performance on Kepler k20 than Fermi NVIDIA Tesla ?

Accelerated Computing HPC Compilers Legacy PGI Compilers
1

Hi,

Can we always get better performance on Kepler k20 than that on Fermi Tesla GPU?

I used pgi 12.10.0 with OpenACC to compile a code and found that the performance on K20 becomes worse. Is it related to the rather old version of PGI or there are any specific parameters available for the Kepler k20 GPU ?

Thanks you very much for your help.

2

Hi jigo3635,

Can we always get better performance on Kepler k20 than that on Fermi Tesla GPU?

I don’t think you will always get better performance on a K20, but in most cases, you should.

Is it related to the rather old version of PGI or there are any specific parameters available for the Kepler k20 GPU ?

Without analysis there’s no way for me to know the cause of the difference. However, the 13.x compilers did ship with CUDA 5 (-ta=nvidia,5.0) which may help.

  • Mat