題目如題下:
Multiple choices-please circle all correct answers
Consider a machine, whose floating-point(FP) and multimedia(MMX)
instructions have two times throuthput than integer(INT) instructions.
Suppose we enhance the machine by making FP and MMX instructions 4 and
2 times faster, respectively, with no improvements to the INT instructions,
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which of the following statements are correct?
(A)The enhancement comes from an increased clock rate.
(B)The enhancement comes from increased cache sizes.
(C)Two benchmarks both consist of only INT, FP, and MMX instructions.
the mix of instructions of the two benchmarks are 1:3:6 and 2:4:4,
respectively(INT:FP:MMX).The first benchmark is more ideal to show
off the enhanced machine.
(D)It is impossible to speedup the first benchmark in (C) six times on the
enhanced machine.
答案是:CD
我覺得(A)錯的原因是因為fast instruction不會影響clock rate
可是其他BCD選項我就不知道為什麼了@@"
有請各位板眾幫忙解題.....
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