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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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