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Foil 78 Necessary Latency to Support Three Categories

From Second set of lectures on CPS615 Parallel Computing Overview CPS615 Basic Simulation Track for Computational Science -- Fall Semester 95. by Geoffrey C. Fox *
This is formal latency to ensure that one can reach design goals of previous table. I picosecond (Category I) cannot be attained. You solve this by having N concurrent streams -- Then each of them needs latency of N picoseconds
e.g. If output rate of an arithmetic unit is 1 per nanosecond, then each of 400 teraflop CPU's in Category I design must have 1000 arithmetic units running at full speed to each full system performance of 0.4 petaflops
See Chapter 6 of Petaflops Report -- July 94

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