vbatts/llama.cpp
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Fixed Windows performance

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This commit is contained in:
JohannesGaessler 2023-06-13 22:37:17 +02:00
parent dba14529de
commit 51830ee5e6
1 changed files with 11 additions and 4 deletions
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15
llama.cpp
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@ -1155,19 +1155,26 @@ static void llama_model_load_internal(
ggml_backend backend_norm;
ggml_backend backend_output;
if (n_gpu_layers > int(n_layer)) { // NOLINT
backend_norm = LLAMA_BACKEND_OFFLOAD;
// norm is not performance relevant on its own but keeping it in VRAM reduces data copying
// on Windows however this is detrimental unless everything is on the GPU
#ifndef _WIN32
backend_norm = low_vram ? GGML_BACKEND_CPU : LLAMA_BACKEND_OFFLOAD;
#else
backend_norm = low_vram || n_gpu_layers <= (int) n_layer + 2 ? GGML_BACKEND_CPU : LLAMA_BACKEND_OFFLOAD;
#endif // _WIN32
backend_output = LLAMA_BACKEND_OFFLOAD_SPLIT;
} else {
backend_norm = GGML_BACKEND_CPU;
backend_output = GGML_BACKEND_CPU;
}
// norm is not performance relevant on its own but keeping it in VRAM reduces data copying:
model.norm = ml->get_tensor("norm.weight", {n_embd}, backend_norm);
model.output = ml->get_tensor("output.weight", {n_embd, n_vocab}, backend_output);
if (backend_output == GGML_BACKEND_GPU_SPLIT) {
LLAMA_ASSERT(backend_norm == GGML_BACKEND_GPU);
if (backend_norm == GGML_BACKEND_GPU) {
vram_weights += ggml_nbytes(model.norm);
}
if (backend_output == GGML_BACKEND_GPU_SPLIT) {
vram_weights += ggml_nbytes(model.output);
}
}