3.1 What will the speedup be if both improvements are made?

題組內容

3. You are going to enhance a computer, and there are two possible improvements: either make multiply instructions run four times faster than before, or make memory access instructions run two times faster than before. You repeatedly run a program that takes 100 seconds to execute. Of this time, 20% is used for multiplication, 50% for memory access instructions, and 30% for other tasks.

1.3 Consider an architecture that is similar to MIPS except that it supports update addressing for data transfer instructions. If we run SPEC2000int using this architecture, some percentage of the data transfer instructions will be able to make use of the new instructions, and for each instruction changed, one arithmetic instruction can be eliminated. If 25% of the data transfer instructions can be changed, which will be faster for SPEC2000int, the modified MIPS architecture or the unmodified architecture? How much faster? (Assume that both architectures have CPI values as given in the above table and that the modified architecture has its cycle time increased by 20% in order to accommodate the new instructions.)

題組內容

3.1 What will the speedup be if both improvements are made?

相關申論題

相關試卷