Answered: Answer the given question with a proper…

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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Answer the given question with a proper explanation and step-by-step solution.

Devise formulas (based on n, p and i) for my_first_i and my_last_i for processor i, in the global sum example (Like above). Assume that the processor numbers and array index start from 0. Remember that each core should be assigned roughly the same number of elements of computations in the loop. Hint: First consider the case when n is evenly divisible by p.

n --> total number (1,2,3 .... n)
p --> total number of processors

We need to calculate sum of numbers.

■ We have p cores, p much smaller than n.
■ Each core performs a partial sum of
approximately n/p values.
2
my_sum = 0;
my_first_i = .
my_last_i = .
for (my_i
my_x = Compute_next_value (.. .);
my_sum += my_x;
=
= my_first_i; my_i < my_last_i; my_i++) {
}
Each core uses it's own private variables
and executes this block of code
independently of the other cores.

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