Matmul Optimization Bottleneck: Data Movement, Not Multiplications
yaroslavvb · x · 2026-08-19
Discusses the bottleneck in matmul performance optimization. Notes that the PRAM model is obsolete due to wire delays. Modeling these delays (as in arxiv 2205.04934) shows that the matmul lower bound is known and achieved by systolic arrays. Performance in modern computers is dominated by data movement costs, not the number of multiplications.
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