8000 MLA kv cache: fix split graph backend assignment when kv cache store on CPU by xiang1guo · Pull Request #13648 · ggml-org/llama.cpp · GitHub
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MLA kv cache: fix split graph backend assignment when kv cache store on CPU #13648

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MLA kv cache: fix split graph backend assignment when kv cache store on CPU #13648

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src: llama-graph: MLA kv cache: fix split graph backend assignment wh… 
…en kv cache store on CPU
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@xiang1guo
xiang1guo committed May 20, 2025
commit 0fb5ca66fa2cb4dc3756b10b2892b2f8c7c9a167
4 changes: 4 additions & 0 deletions src/llama-graph.cpp
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Expand Up @@ -1156,6 +1156,10 @@ ggml_tensor * llm_graph_context::build_attn_mha(
// for MLA with the absorption optimization, we need to "decompress" from MQA back to MHA
if (v_mla) {
kqv = ggml_mul_mat(ctx0, v_mla, kqv);
// all nodes between the KV store and the attention output are run on the CPU
if (!cparams.offload_kqv) {
ggml_backend_sched_set_tensor_backend(sched, kqv, backend_cpu);
}
}

cur = ggml_permute(ctx0, kqv, 0, 2, 1, 3);
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