40 lines
1.5 KiB
Python
40 lines
1.5 KiB
Python
"""QKV GEMM benchmark: Q*K^T projection on all PEs in a cube (multi-PE).
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Column-parallel GEMM: a is replicated (cube-level), b/out are column-sharded.
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M_CPU fans out KernelLaunchMsg to all 8 PE_CPUs (ADR-0009 D3).
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Kernel: tl.load(a) + tl.ref(b) + tl.composite(gemm) + tl.wait()
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- Tensor a is loaded into TCM via DMA
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- Tensor b stays in HBM; PE_SCHEDULER streams it per-tile (32x64x32)
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"""
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from kernbench.policy.placement.dp import DPPolicy
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# GEMM dimensions: (M, K) x (K, N) -> (M, N)
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M, K, N = 128, 256, 128
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DTYPE = "f16"
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def _gemm_kernel(a_ptr, b_ptr, out_ptr, M, K, N, tl, DTYPE="f16"):
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"""QKV GEMM kernel: out = a @ b.
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a is loaded into TCM (DMA_READ).
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b is referenced in HBM (tl.ref, no DMA -- scheduler streams per-tile).
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"""
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a = tl.load(a_ptr, shape=(M, K), dtype=DTYPE)
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b = tl.ref(b_ptr, shape=(K, N), dtype=DTYPE)
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handle = tl.composite(op="gemm", a=a, b=b, out_ptr=out_ptr)
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tl.wait(handle)
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def run(ctx):
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"""Run the multi-PE QKV GEMM benchmark."""
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# DP placement: a=replicate (cube-level), b/out=column_wise (N-axis split)
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a = ctx.zeros((M, K), dtype=DTYPE, dp=DPPolicy(cube="replicate", pe="replicate"), name="a")
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b = ctx.zeros((K, N), dtype=DTYPE, dp=DPPolicy(cube="replicate", pe="column_wise"), name="b")
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out = ctx.empty(
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(M, N), dtype=DTYPE, dp=DPPolicy(cube="replicate", pe="column_wise"), name="out",
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)
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# Launch GEMM kernel on all PEs
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ctx.launch("qkv_gemm_multi", _gemm_kernel, a, b, out, M, K, N)
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