1. Which of the following instructions should be allowed only in kernel mode? (a) Disable all interrupts. (b) Read the time-of-day clock. (c) Set the time-of-day clock. (d) Change the memory map. 2. Consider a system that has two CPUs, each CPU having two threads (hyperthreading). Suppose three programs, P0, P1, and P2, are started with run times of 5, 10 and 20 msec, respectively. How long will it take to complete the execution of these programs? Assume that all three programs are 100% CPU bound, do not block during execution, and do not change CPUs once assigned.
1. Which of the following instructions should be allowed only in kernel mode? (a) Disable all interrupts. (b) Read the time-of-day clock. (c) Set the time-of-day clock. (d) Change the memory map. 2. Consider a system that has two CPUs, each CPU having two threads (hyperthreading). Suppose three programs, P0, P1, and P2, are started with run times of 5, 10 and 20 msec, respectively. How long will it take to complete the execution of these programs? Assume that all three programs are 100% CPU bound, do not block during execution, and do not change CPUs once assigned.
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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*If you answer the questions correctly and handwrite your answers, I will give you a thumbs up. Thanks.
Transcribed Image Text:Please answer the following Operating Systems Questions:
1. Which of the following instructions should be allowed only in kernel mode? (a)
Disable all interrupts. (b) Read the time-of-day clock. (c) Set the time-of-day clock.
(d) Change the memory map.
2. Consider a system that has two CPUs, each CPU having two threads
(hyperthreading). Suppose three programs, P0, P1, and P2, are started with run times
of 5, 10 and 20 msec, respectively. How long will it take to complete the execution of
these programs? Assume that all three programs are 100% CPU bound, do not block
during execution, and do not change CPUs once assigned.
* Please answer correctly and completely. Thank you.
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