Multi-thread Performance Improvement of GEMM with DIVIDE_RATE=1 for A64FX #5353
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Closes #5347
This PR improves the multi-thread performance of GEMM on A64FX by setting
DIVIDE_RATEto 1.The thread control in GEMM currently uses default value of DIVIDE_RATE=2, which always splits N dimension of matrix into two parts for computation. However, this splitting occurs even when N is small (e.g., N=2), leading to a decrease in computational efficiency.
For GEMM on A64FX, I tried DIVIDE_RATE=1 and confirmed performance improvements as shown in the graphs below.
While improvements were expected for narrow matrices with small N dimensions, performance gains were also observed for square matrices.