Determine How Much Parallelism is Needed - 2023.2 English

Vitis Unified Software Platform Documentation: Application Acceleration Development (UG1393)

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2023.2 English

After the equation above has been calculated, it is possible to estimate the initial HW/SW performance ratio:

Speed-up = THW/TSW = Fmax * Running Time /Vops

Without any parallelization, the initial speed-up will most likely be less than 1.

Next, calculate how much parallelism is needed to meet the performance goal:

Parallelism Needed = TGoal / THW = TGoal * Vops / (Fmax * max(VINPUT, VOUTPUT))

This parallelism can be implemented in various ways: by widening the datapath, by using multiple engines, and by using multiple kernel instances. The developer should then determine the best combination given their needs and the characteristics of their application.