Answered: Consider the following processes:…

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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Question

Consider the following processes:
Process Arrival Time Service Time

A	0	4
B	1	3
C	2	3
D	2	2
E	3	1
F	5	3

Show (draw the schedule, x-axis is time, and one row for each CPU) how the above
processes execute over time on a system with 2 CPUs. Compute the average turnaround
time for all processes and the average utilization for each CPU under each of the following

schedulers:

(a) FCFS with a single Ready Queue. A process gets scheduled once one of the CPUs
is available. When both CPUs are available, we select CPU1.
(b) FCFS with a Ready Queue per CPU. Processes A, B, and C go to CPU1 and processes
D, E, and F go to CPU2.
(c) HRRN with a single Ready Queue. A process gets scheduled once one of the CPUs
is available. When both CPUs are available, we select CPU1.

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