Amdahl's Law

Question

Please explain the Amdahl's Law in details in simple way...I am not getting it from wikipedia

Comments

Give some specific question regarding this topic so as to make u understand..:)

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Thank you for your response.. whenever I will get the question then I will post it here..I was doing the theory part that's why I have asked..

Answer 1

Lets first understand  Amdahl's law

Amdahl's law is used to find out overall speedup of the system when some part of the system is enhanced.

Here,for example we have a system in which 40% operations are floating point

Suppose we enhance floating point unit such that it becomes 30 times faster.

Now,we need to find overall speedup to the system.

So, according to formula,

here,p=40/100=0.4 (we need to express p in proportion)

        s=30

Total Speedup =1/((1-0.4)+(0.4/30))

                       =1/((0.6)+0.014)

                       =1/(0.614)

                       =1.62

Lets take some other examples,

Here p=90%=0.9

        s=30

Total speedup=1/((1-0.9)+(0.9/30))

                      =1/(0.1+0.03)

                     =1/(0.13)

                    =7.69

s=40

p=75%=0.75

Total speedup=1/((1-0.75)+(0.75/40))

                      =1/(0.26875)

                     =3.72

        

Comments

yeah, questions were not asked and this topic is also not mentioned in syllabus. I prepared this topic previously and had seen questions related to it in test series, that's why I said yes. Sorry, I might be wrong.

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Yeah I found few questions but those were in UGC-NET exam.

So, I am leaving this will see later if time permits.

Thanks.

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Even though its not asked in previous year gate exam, The topic is very easy.

its just sequential doesn’t benefit, parallel part gets divided