CUDA: use 1 thread if model is fully offloaded #2915
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Maybe update the help for It might be good to mention the ability to set it to |
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Using 1 vs 15 for me does make it .2-.5 tokens faster. |
ggerganov
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Sep 2, 2023
common/common.cpp
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| #ifdef GGML_USE_CUBLAS | ||
| if (params.n_gpu_layers >= llama_model_n_layer(model) + 3) { | ||
| params.n_threads = 1; | ||
| } | ||
| #endif // GGML_USE_CUBLAS |
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This is an implementation detail that the user should not need to know and in the future we will fix this anyway
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I haven't forgotten about this, I've only prioritized other things because I think that this is not that high priority. |
JohannesGaessler
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@ggerganov thank you for the hint with |
slaren
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Sep 18, 2023
ggerganov
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Sep 21, 2023
pkrmf
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Currently when using the maximum possible number of GPU layers with CUDA there is no benefit from > 1 thread. In fact, using more than 1 thread is detrimental due to increased overhead. This PR changes the logic for the default number of threads in such a way that (unless the user manually overrides it) only a single thread is used if all layers are offloaded.
I also changed the logic for
llama-benchto be the same asmain: -1 is interpreted as the number of logical cores.