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vulkan: support sparse Flash Attention (#28105)

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* vulkan: add sparse Flash Attention support for DSV4/GLM

* tune implementation

* add tests

* avoid nondeterministic atomicAdd

* add cm2 decode vector support

* simplify logic and make variable names more consistent

* add cm2 f16vec4 binding for decode vector
This commit is contained in:
Ruben Ortlam
2026-09-15 11:30:27 +02:00
committed by GitHub
parent 77d554b26d
commit fc82583e65
8 changed files with 412 additions and 67 deletions
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tests/test-backend-ops.cpp
+11
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@@ -10707,6 +10707,9 @@ static std::vector<std::unique_ptr<test_case>> make_test_cases_eval() {
test_cases.emplace_back(new test_flash_attn_ext(128, 128, 1, { 8, 1}, 4096, 1, true, false, 0, 0, GGML_PREC_F32, GGML_TYPE_Q8_0, GGML_TYPE_Q8_0, {0, 1, 2, 3}, true, false, 512));
test_cases.emplace_back(new test_flash_attn_ext(128, 128, 1, { 8, 1}, 4096, 64, true, false, 0, 0, GGML_PREC_F32, GGML_TYPE_Q8_0, GGML_TYPE_Q8_0, {0, 1, 2, 3}, true, false, 512));
// Qwen QSA: 256/256, gqa 12, budget 2048.
test_cases.emplace_back(new test_flash_attn_ext(256, 256, 2, {12, 1}, 8192, 1, true, false, 0, 0, GGML_PREC_F32, GGML_TYPE_F16, GGML_TYPE_F16, {0, 1, 2, 3}, true, false, 2048));
// more V-is-sub-view-of-K cases: other head shapes, and full views with equal head sizes
test_cases.emplace_back(new test_flash_attn_ext(320, 256, 1, {32, 1}, 512, 1, true, false, 0, 0, GGML_PREC_F32, GGML_TYPE_F16, GGML_TYPE_F16, {0, 1, 2, 3}, true, true));
test_cases.emplace_back(new test_flash_attn_ext(192, 128, 4, {8, 1}, 512, 1, true, false, 0, 0, GGML_PREC_F32, GGML_TYPE_F16, GGML_TYPE_F16, {0, 1, 2, 3}, true, true));
@@ -11165,6 +11168,14 @@ static std::vector<std::unique_ptr<test_case>> make_test_cases_perf() {
// Qwen3-VL-8B https://github.com/ggml-org/llama.cpp/issues/17012
test_cases.emplace_back(new test_flash_attn_ext(72, 72, 16, {1, 1}, 5776, 5776, false, false, 0, 0, GGML_PREC_F32, GGML_TYPE_F16, GGML_TYPE_F16));
// Sparse flash attention (n_kv_max hint) decode across KV depths.
// Shapes: 576/512 DeepSeek MLA, 512/512 DeepSeek-V4/GLM-5.2, 256/256 gqa12 Qwen QSA.
for (int64_t kv : {4096, 16384, 32768}) {
test_cases.emplace_back(new test_flash_attn_ext(512, 512, 1, { 8, 1}, kv, 1, true, false, 0, 0, GGML_PREC_F32, GGML_TYPE_F16, GGML_TYPE_F16, {0, 1, 2, 3}, true, false, 512));
test_cases.emplace_back(new test_flash_attn_ext(576, 512, 1, {16, 1}, kv, 1, true, false, 0, 0, GGML_PREC_F32, GGML_TYPE_F16, GGML_TYPE_F16, {0, 1, 2, 3}, true, true, 512));
test_cases.emplace_back(new test_flash_attn_ext(256, 256, 2, {12, 1}, kv, 1, true, false, 0, 0, GGML_PREC_F32, GGML_TYPE_F16, GGML_TYPE_F16, {0, 1, 2, 3}, true, false, 2048));
}
test_cases.emplace_back(new test_flash_attn_ext(64, 64, 8, {8, 1}, 7680, 1, true, false, 0, 0, GGML_PREC_F32, GGML_TYPE_F16, GGML_TYPE_F16));
test_cases.emplace_back(new test_flash_attn_ext(64, 64, 8, {8, 1}, 7680, 4, true, false, 0, 0, GGML_PREC_F32, GGML_TYPE_F16, GGML_TYPE_F16));
test_cases.emplace_back(new test_flash_attn_ext(64, 64, 8, {8, 1}, 7680, 1, true, false, 0, 0, GGML_PREC_F32, GGML_TYPE_Q4_0, GGML_TYPE_Q4_0));