申論題

2.3 For an application program running on a multi-processor system with 32 processors, it takes 200 ns to handle reference in a remote memory. Assume that this application program always bas hits in the local mem nory except for remote memor ry access involving commun nication. Proc cessors are stalled on a remote request, and the processor clock is 3.3 GHz. Assume that the base CPI (cycles per instruction) is 0.5 and all references hit in cache. How much faster is the multi-processor if there is no communicatio ion versus if 0.2% of instructions s involve remote e communication. references? Hint: compute the new CPI first. The speedup is the ratio of the two CPI values.