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multithreadingopenclcpu
EvanzzzZ
EvanzzzZ

Reputation: 111

OpenCL program running on CPU

I want to compare the performance of single-core CPU and multi-core CPU. I wrote a program and let it iterate 1000 times on a single-core CPU to see the running time. In the multi-core case, I used OpenCL to launch a kernel that where the code is same as that inside the iteration in the first case.

Considered multi-core could run 8 concurrent threads, theoretically, the running time of multi-core case should be above T(single-core)/8. But the results is that the T(multi-core) is almost 1/20 of T(single-core).

I wonder why this happen? Did OpenCL compiler do some optimization for multi-core CPU ?

Upvotes: 0

Views: 344

Answers (1)

Bahbar
Bahbar

Reputation: 18015

If your single core code was scalar, chances are the opencl runtime used sse or avx and get an extra multiplier.

Upvotes: 2

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