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In a demand paging system, the page table is stored in RAM. Processor access (read or write a word) time to RAM is given as R, time to read a frame from hard disk is DR and time to write a frame to hard disk is DW. If page fault probability is F, and the probability that a page to be swapped out is dirty is D, what is the expression that correctly represents the average memory access time? OR+ (1- F) * R+D* DR + (1– D) * DW OR+ (1- F) * DR +F*( DR + (1 – D) * (DR + DW)) O 2*R+F* (DR + D 'DW) R-E:1- DI: D W +D:DR+ RI

In a demand paging system, the page table is stored in RAM. Processor access (read or write a word) time to RAM is given as R, time to read a frame from hard disk is DR and time to write a frame to hard disk is DW. If page fault probability is F, and the probability that a page to be swapped out is dirty is D, what is the expression that correctly represents the average memory access time? OR+ (1- F) * R+D* DR + (1– D) * DW OR+ (1- F) * DR +F*( DR + (1 – D) * (DR + DW)) O 2*R+F* (DR + D 'DW) R-E:1- DI: D W +D:DR+ RI

Database System Concepts
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
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In a demand paging system, the page table is stored in RAM. Processor access (read or write a word) time to RAM is given as R, time to read a frame from hard disk is DR and time to write a frame to hard disk is DW. If page fault probability is F, and the probability that a page to be swapped out is dirty is D, what is the expression that correctly represents the average memory access time? OR+ (1- F) * R +D* DR + (1 – D) * DW OR+ (1 - F) * DR + F* ( DR + (1 – D) * (DR + DW)) O 2* R+F* (DR + D * DW) OR+F* ((1 – D) * DW + D* DR + R) DR + DW + F* (DR + R) + (1 – D) * ( DR + DW + R)
Transcribed Image Text:In a demand paging system, the page table is stored in RAM. Processor access (read or write a word) time to RAM is given as R, time to read a frame from hard disk is DR and time to write a frame to hard disk is DW. If page fault probability is F, and the probability that a page to be swapped out is dirty is D, what is the expression that correctly represents the average memory access time? OR+ (1- F) * R +D* DR + (1 – D) * DW OR+ (1 - F) * DR + F* ( DR + (1 – D) * (DR + DW)) O 2* R+F* (DR + D * DW) OR+F* ((1 – D) * DW + D* DR + R) DR + DW + F* (DR + R) + (1 – D) * ( DR + DW + R)
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