clpeak

A synthetic micro-benchmark that measures the peak achievable performance of GPU compute devices. It exercises tight vector / MAD / MMA loops and vendor-SDK GEMM libraries (cuBLASLt on NVIDIA, MPS on Apple) to expose what the hardware is capable of — from raw ALU peaks to near-vendor-advertised matrix throughput. clpeak began as an OpenCL-only tool. It now ships four interchangeable backends — OpenCL, Vulkan, CUDA, and Metal — running back-to-back on the same hardware, so cross-stack differences (driver lowering, instruction scheduling, extension exposure) become visible alongside the raw peak numbers.

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