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1. Consider a machine running a program with four classes of instructions: A/B/C/D. The program requires 360 seconds, with the number of seconds executing each class as shown in the table below: Instruction Class A B C Time (sec) 100 80 120 60 1.1. By how much is the total execution time changed if the time for class D is reduced by 20% and the time for class C is increased by 10% (assuming no other changes)? 1.2. If we want to reduce the total execution time by 20% by optimizing class A only, what is the target execution time of class A instructions in order to achieve the reduction (assuming all other instructions are not changed)? 1.3. Can the total time be reduced by 25% if we only optimize class B? Use calculation to justify your answer.

1. Consider a machine running a program with four classes of instructions: A/B/C/D. The program requires 360 seconds, with the number of seconds executing each class as shown in the table below: Instruction Class A B C Time (sec) 100 80 120 60 1.1. By how much is the total execution time changed if the time for class D is reduced by 20% and the time for class C is increased by 10% (assuming no other changes)? 1.2. If we want to reduce the total execution time by 20% by optimizing class A only, what is the target execution time of class A instructions in order to achieve the reduction (assuming all other instructions are not changed)? 1.3. Can the total time be reduced by 25% if we only optimize class B? Use calculation to justify your answer.

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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1. Consider a machine running a program with four classes of instructions: A/B/C/D. The program requires 360 seconds, with the number of seconds executing each class as shown in the table below: Instruction Class A B C Time (sec) 100 80 120 60 1.1. By how much is the total execution time changed if the time for class D is reduced by 20% and the time for class C is increased by 10% (assuming no other changes)? 1.2. If we want to reduce the total execution time by 20% by optimizing class A only, what is the target execution time of class A instructions in order to achieve the reduction (assuming all other instructions are not changed)? 1.3. Can the total time be reduced by 25% if we only optimize class B? Use calculation to justify your answer.
Transcribed Image Text:1. Consider a machine running a program with four classes of instructions: A/B/C/D. The program requires 360 seconds, with the number of seconds executing each class as shown in the table below: Instruction Class A B C Time (sec) 100 80 120 60 1.1. By how much is the total execution time changed if the time for class D is reduced by 20% and the time for class C is increased by 10% (assuming no other changes)? 1.2. If we want to reduce the total execution time by 20% by optimizing class A only, what is the target execution time of class A instructions in order to achieve the reduction (assuming all other instructions are not changed)? 1.3. Can the total time be reduced by 25% if we only optimize class B? Use calculation to justify your answer.
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