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CUDA: make the alloc_deps check batch independent

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Fixes #29980
This commit is contained in:
Aman Gupta
2026-10-05 17:59:15 +08:00
parent 8e1642198d
commit 9f80c69e3b
1 changed files with 6 additions and 2 deletions
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ggml/src/ggml-cuda/ggml-cuda.cu
+6 -2
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@@ -1846,11 +1846,14 @@ static bool ggml_cuda_match_shared_expert(const ggml_cgraph * graph, int routed_
return (a == graph->nodes[idx] && b == graph->nodes[idx + 1]) ||
(b == graph->nodes[idx] && a == graph->nodes[idx + 1]);
};
// only batch-size independent checks here: graph_optimize must produce the same graph topology for every ubatch
// size, otherwise ggml-alloc has to re-reserve (and the scheduler to synchronize) at runtime.
// the MMVQ batch size check is done in ggml_cuda_try_fuse
if (!is_pair(gate, up, routed_idx) || !is_pair(shared_gate, shared_up, shared_idx) ||
!ggml_cuda_should_fuse_mul_mat(up, gate, routed) ||
!ggml_cuda_should_fuse_mul_mat(shared_up, shared_gate, shared) ||
!up->src[0]->buffer ||
!ggml_cuda_should_fuse_mul_mat_vec_q(up)) {
!ggml_is_quantized(up->src[0]->type)) {
return false;
}
const ggml_tensor * input = up->src[1];
@@ -3510,7 +3513,8 @@ static int ggml_cuda_try_fuse(ggml_backend_cuda_context * cuda_ctx, ggml_cgraph
ggml_tensor * node = cgraph->nodes[i];
if (node->op == GGML_OP_MUL_MAT_ID && cuda_ctx->stream_context().concurrent_events.empty() &&
ggml_cuda_match_shared_expert(cgraph, i, i + 3)) {
ggml_cuda_match_shared_expert(cgraph, i, i + 3) &&
ggml_cuda_should_fuse_mul_mat_vec_q(cgraph->nodes[i + 2]->src[1])) {
const int outputs[] = { i + 2, i + 5 };
if (ggml_cuda_check_fusion_memory_ranges(cgraph, i, 6, outputs, 2)) {
ggml_tensor * routed = cgraph->nodes[i + 2];