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by thu2111
2249 days ago
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Yes, communications overhead. SIMD instructions in the CPU have direct access to all the same registers and data as regular instructions. Moving data to a GPU and back is a very expensive operation relative to that. The chips are just physically further away and have to communicate mostly via memory. Consider a typical use case for SIMD instructions - you just decrypted an image or bit of audio downloaded over SSL and want to process it for rendering. The data is in the CPU caches already. SIMD will munch it. |
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