Answered: Consider a program containing ‘j’…

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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Consider a program containing ‘j’ instructions of which ‘k’ instructions are loop instructions. The program is executed on a system that contains cache. Instruction fetch from memory costs ‘l’ nano-second while that for cache costs ‘m’ nano-second. If loop is executed ‘n’ times and every other instruction is executed once only, a) derive an expression for the speedup due to use of cache (ratio of the program execution time without cache to the program execution time with cache). Assume, cache is empty initially and is large enough to hold the loop completely and all the data required by the program is hard-coded in the program. b) If j = 1500, k = (your registration number), l = 20 nano-seconds , m = 2 nano-seconds, and n = 100 calculate the speedup using your expression derived in ‘a’ part.

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