Answered: Amdahl's Law is as applicable to…

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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Amdahl's Law is as applicable to software as it is to hardware. An oft-cited programming
truism states that a program spends 90% of its time executing 10% of its code. Thus, tuning
a small amount of program code can often time have an enormous affect on the overall
performance of a software product. Determine the overall system speedup if:
a. 90% of a program is made to run 10 times as fast (900% faster).
b. 80% of a program is made to run 20% faster.
4. Name the four types of I/O architectures. Where are each of these typically used and why
are they used there?
5. A CPU with interrupt-driven I/O is busy servicing a disk request. While the CPU is midway
through the disk-service routine, another I/O interrupt occurs.
a. What happens next?
b. Is it a problem?
c. If not, why not? If so, what can be done about it?

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