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[Model Bash] DeepSeek R1 BF16 Min Latency QKV A GEMM (0.5% E2E Speedup) #34758

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Merged
vllm-bot merged 12 commits into from
Feb 18, 2026
Merged

[Model Bash] DeepSeek R1 BF16 Min Latency QKV A GEMM (0.5% E2E Speedup) #34758

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9557cfc
initial commit
Feb 17, 2026
c3d3de5
update to make the changes deepseek specific
Feb 17, 2026
9788498
update build
Feb 18, 2026
3b525e4
Swich which layer
Feb 18, 2026
29127d4
update cmaklists
Feb 18, 2026
6b7048b
fix build
Feb 18, 2026
5b24998
fix missing symbol
Feb 18, 2026
72fc063
thanks claude!
Feb 18, 2026
41f9f7d
is new sonnet the best model?
Feb 18, 2026
c497839
remove duplicate
Feb 18, 2026
61edbde
remove debug cruft
Feb 18, 2026
c354d75
address mgoin comments
Feb 18, 2026
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19 changes: 19 additions & 0 deletions CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -771,6 +771,25 @@ if(VLLM_GPU_LANG STREQUAL "CUDA")
endif()
endif()

# DeepSeek V3 fused A GEMM kernel (requires SM 9.0+, Hopper and later)
# This kernel implements a highly optimized GEMM for the DeepSeek V2/V3
# Q/KV "A" projection (hidden_size=7168 -> q_lora_rank+kv_lora_rank+rope=2112)
# at small batch sizes (1-16 tokens), using Hopper-specific async copy and
# mbarrier instructions.
cuda_archs_loose_intersection(FUSED_A_GEMM_ARCHS "9.0a;" "${CUDA_ARCHS}")
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if(FUSED_A_GEMM_ARCHS)
set(SRCS "csrc/gemm/dsv3_fused_a_gemm.cu")
set_gencode_flags_for_srcs(
SRCS "${SRCS}"
CUDA_ARCHS "${FUSED_A_GEMM_ARCHS}")
list(APPEND VLLM_EXT_SRC "${SRCS}")
list(APPEND VLLM_GPU_FLAGS "-DENABLE_DSV3_FUSED_A_GEMM=1")
message(STATUS "Building dsv3_fused_a_gemm for archs: ${FUSED_A_GEMM_ARCHS}")
else()
message(STATUS "Not building dsv3_fused_a_gemm as no compatible archs found "
"in CUDA target architectures.")
endif()

# moe_data.cu is used by all CUTLASS MoE kernels.
if(${CMAKE_CUDA_COMPILER_VERSION} VERSION_GREATER_EQUAL 13.0)
cuda_archs_loose_intersection(CUTLASS_MOE_DATA_ARCHS "9.0a;10.0f;11.0f;12.0f" "${CUDA_ARCHS}")
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