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Worklog: Optimising GEMM on NVIDIA H100 for cuBLAS-like Performance (WIP)

hamzaelshafie.bearblog.dev · published 12 January 2026

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Outperforming cuBLAS on H100: a Worklog Read at the source ↗
cudaforfun.substack.com
How to Optimize a CUDA Matmul Kernel for cuBLAS-like Performance: a Worklog Read at the source ↗
siboehm.com
https://github.com/HamzaElshafie/h100_gemm
github.com
Inside NVIDIA GPUs: Anatomy of high performance matmul kernels Read at the source ↗
aleksagordic.com
https://en.wikipedia.org/wiki/Interposer
en.wikipedia.org
https://developer.nvidia.com/blog/using-cuda-warp-level-primitives/
developer.nvidia.com
https://resources.nvidia.com/en-us-hopper-architecture/nvidia-h100-tensor-c
resources.nvidia.com
Strangely, Matrix Multiplications on GPUs Run Faster When Given "Predictable" Data! [short] Read at the source ↗
thonking.ai
https://github.com/HamzaElshafie/h100_gemm/tree/main
github.com
https://godbolt.org/z/86M7brE1K
godbolt.org
https://godbolt.org/z/qqhYvYoP1
godbolt.org
https://feldmann.nyc/blog/smem-microbenchmarks
feldmann.nyc
https://microarch.org/micro53/papers/738300a996.pdf
microarch.org
https://docs.nvidia.com/cuda/cuda-driver-api/group__CUDA__TENSOR__MEMORY.html
docs.nvidia.com
https://docs.nvidia.com/cuda/parallel-thread-execution/index.html?spm=a2ty_o01.29997173.0.0.883dc921B6BCcR
docs.nvidia.com
https://docs.nvidia.com/cuda/parallel-thread-execution/
docs.nvidia.com
https://docs.nvidia.com/cuda/cuda-programming-guide/04-special-topics/async-barriers.html
docs.nvidia.com
https://github.com/pranjalssh/fast.cu/blob/main/examples/matmul/matmul_4.cuh
github.com