Equation 7 · How AI Accelerator Architecture Actually Works
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Symbol r
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Consider an idealised r c array holding one operand stationary, with a second operand streamed through in a sequence of length L — for instance, L activation vectors passed through a weight-stationary array of r input rows and c output columns. Before the first result emerges, the data has to propagate across the array’s diagonal, costing roughly r + c - 2 cycles; after the last input enters, the same number of cycles is needed to drain the pipeline. Total latency is therefore approximately
Sources cited in the article section
- [7] Roofline: An Insightful Visual Performance Model for Floating-Point Programs and Multicore Architectures ↗
- [2] In-Datacenter Performance Analysis of a Tensor Processing Unit ↗
- [6] SCALE-Sim: Systolic CNN Accelerator Simulator ↗
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