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CUDA: Allow concurrent streams per split for multi-GPU #28198

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Merged
am17an merged 2 commits into from
Sep 3, 2026
+3 −1
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CUDA: Allow concurrent streams per split for multi-GPU #28198

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044a1d6
CUDA: Allow CUDA optimization per split for multi-GPU.
tannerbruhn Aug 31, 2026
3f4500f
Update ggml/src/ggml-cuda/ggml-cuda.cu
tannerbruhn Sep 2, 2026
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4 changes: 3 additions & 1 deletion ggml/src/ggml-cuda/ggml-cuda.cu
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Expand Up @@ -4365,10 +4365,12 @@ static void ggml_backend_cuda_graph_optimize(ggml_backend_t backend, ggml_cgraph
ggml_cuda_stream_context & stream_context = cuda_ctx->stream_context();
stream_context.reset();

if (!use_cuda_graph || ggml_backend_cuda_get_device_count() != 1) {
if (!use_cuda_graph) {
return;
}

ggml_cuda_set_device(cuda_ctx->device);

// number of out-degrees for a particular node
std::unordered_map<const ggml_tensor *, int> fan_out;
// reverse mapping of node to index in the cgraph
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