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Don't interefe with BLAS for large prompts by running only 1 thread

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Georgi Gerganov 2023-03-25 17:03:10 +02:00
parent ab77d76312
commit 4640eff23d
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1 changed files with 4 additions and 1 deletions
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llama.cpp
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@ -852,8 +852,11 @@ static bool llama_eval_internal(
};
struct ggml_context * ctx0 = ggml_init(params);
// for big prompts, if BLAS is enabled, it is better to use only one thread
// otherwise, the threads are spin-lock waiting for the BLAS calls and are degrading the performance
ggml_cgraph gf = {};
gf.n_threads = n_threads;
gf.n_threads = N > 255 && ggml_cpu_has_blas() ? 1 : n_threads;
struct ggml_tensor * embd = ggml_new_tensor_1d(ctx0, GGML_TYPE_I32, N);
memcpy(embd->data, tokens, N*ggml_element_size(embd));