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Which speed up could be achieved according to Amdahl’s Law for infinite number of processes if 5% of a program is sequential and the remaining part is ideally parallel ?
Correct Answer: C
Question 458 Explanation:
Step-1: Speed up for infinite number of process uses Amdahl’s law formula is
S = 1 / (1-P)
where,
P is parallel part of program,
sequential part of program is 5%
.
= 1 – sequential part
= 1 – 0.05 (or 5%)
= 0.95 (or 95%)
Step-2: Apply into the formula is
S = 1 / (1-P)
S = 1 / (1-0.95)
S = 1 / 0.05
S = 20
S = 1 / (1-P)
where,
P is parallel part of program,
sequential part of program is 5%
.
= 1 – sequential part
= 1 – 0.05 (or 5%)
= 0.95 (or 95%)
Step-2: Apply into the formula is
S = 1 / (1-P)
S = 1 / (1-0.95)
S = 1 / 0.05
S = 20
Infinite
5
20
50
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