Multi-threaded quantization #1075
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Not much gain for simple quantizations, bit it will be important for quantizations that require more CPU cycles.
It now does the job in ~14 seconds on my Mac for Q4_0, Q4_1 and Q4_2. Single-threaded it was taking more than 2 minutes after adding the more elaborate version of Q4_2.
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This could make more accurate but slow quantization methods more practical. (See #835.) |
ggerganov
approved these changes
Apr 20, 2023
After changing chunk_size to const int as suggested by @ggerganov, clang and GCC starting to warn me that I don't need to capture it in the lambda. So, I removed it from the capture list. But that makes the MSVC build fail. So, making it a constexpr to make every compiler happy.
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Please resolve conflicts with the master branch |
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This PR adds multi-threading for quantization.
The gain is very minor for small models (e.g., LLaMA 7B) and simple quantization (
Q4_0andQ4_1), but very significant for large models and the now more elaborateQ4_2quantization.quantize-statsnow finishes in just 14.5 seconds (7B) or 44 seconds (13B) on my computer for all 3 quantization types. The single-threaded version took 144 seconds (7B) or 242 seconds (13B).