vbatts/llama.cpp
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norm & rms_norm can not be threaded:

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after investigation rms norm for quite some time I come to the conclusion that neither norm, nor rms_norm can be threaded, because we need mean over all items, not just of the slices each thread sees.
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xaedes 2023-04-24 04:13:33 +02:00
parent b164343529
commit b908007471
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ggml.c
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@ -13288,8 +13288,8 @@ void ggml_graph_compute(struct ggml_context * ctx, struct ggml_cgraph * cgraph)
case GGML_OP_RMS_NORM:
case GGML_OP_RMS_NORM_BACK:
{
// i think this must not be threaded, because we need mean over all items, not just the slices each thread sees
node->n_tasks = n_threads;
// i think this cannot be threaded, because we need mean over all items, not just the slices each thread sees.
node->n_tasks = 1;
} break;
case GGML_OP_MUL_MAT:
{