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I'm new on CUDA and I would like to ask your help to know if it's possible to change the number of cores to calculate the efficiency and scalability of a program, besides modifying the kernel with the number of threads per block and blocks of threads for execution. That is, if it's assumed that efficiency and scalability are based on the number of processors and I start with 512 cores in my FERMI GPU, How could I change from 512 to 256, 128, etc. cores in order to get differents Speedup's for a given data load?? Thanks in advance!!
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CUDA doesn't support that type of hardware granularity and there is no way to control cores in the way you are asking about.