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Instruction-Aware Transfer of GPU Implementation Crossovers: a Tensor-Product Discontinuous Galerkin Operator on GB200, H100, and A100
We compare up to six implementations of an FP64 tensor-product discontinuous Galerkin operator at p = 7-1023 on GB200, H100, and A100 with fixed numerics, input, and code. The fastest path is machine dependent: at p = 511, a fused-epilogue GEMM path is 5.0% faster than a fused Tensor Core kernel on
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