1. We wish to compare the performance of two different machines: M1 and M2. The following measurements have been made on these machines: Program Time on M1 Time on M2 1 10 seconds 5 seconds 2 3 seconds 4 seconds Which machine is faster for each program, and by how much? 2. For M1 and M2 of problem 1, the following additional measurements are made:. Find the instruction execution rate (instructions per second) for each machine when running program 1. Program Instructions executed on M1 Instructions executed on M2 1 200 x 106 160 x 106 3. For M1 and M2 of problem 1, if the clock rates are 200 MHz and 300 MHz, respectively, find the CPI for program 1 on both machines using the data provided in problems 1 and 2. 4. You are going to enhance a machine, and there are two possible improvements: either make multiply instructions run four times faster than before or make memory access instructions run two times faster than before. You repeatedly run a program that takes 100 seconds to execute. Of this time, 20% is used for multiplication, 50% for memory access instructions, and 30% for other tasks. What will be the speedup if you improve only multiplication? What will be the speedup if you improve only memory access? What will the speedup be if both improvements are made?

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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1. We wish to compare the performance of two different machines: M1 and M2. The following measurements have been made on these machines:

Program	Time on M1	Time on M2
1	10 seconds	5 seconds
2	3 seconds	4 seconds

Which machine is faster for each program, and by how much?

2. For M1 and M2 of problem 1, the following additional measurements are made:. Find the instruction execution rate (instructions per second) for each machine when running program 1.

Program	Instructions executed on M1	Instructions executed on M2
1	200 x 10⁶	160 x 10⁶

3. For M1 and M2 of problem 1, if the clock rates are 200 MHz and 300 MHz, respectively, find the CPI for program 1 on both machines using the data provided in problems 1 and 2.

4. You are going to enhance a machine, and there are two possible improvements: either make multiply instructions run four times faster than before or make memory access instructions run two times faster than before. You repeatedly run a program that takes 100 seconds to execute. Of this time, 20% is used for multiplication, 50% for memory access instructions, and 30% for other tasks.

What will be the speedup if you improve only multiplication?
What will be the speedup if you improve only memory access?
What will the speedup be if both improvements are made?

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