Answered: Figure 5.17 CPE performance for…

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

See similar textbooks

Related questions

Topic Video

Question

Generate a graph of performance improvement for code below. Tip: Figure 5.17 in the textbook provides an example of a graph depicting performance improvements associated with loop unrolling.

code:

//normal code

int main()

{

int n, sum=0;

n=50;

int a[50];

{

for(int i=0; i<n; i++)

{

sum= sum +a[i];

}

printf("sum is %d", sum);

return 0;

}

//with unrolling

int main()

{

int n, sum=0;

n=50;

int a[50]

for(int i=0; i<n; i+=10)

{

scanf("%d", &a[i]);

}

sum= sum + a[0];

sum= sum + a[1];

sum= sum + a[2];

sum= sum + a[3];

sum= sum + a[4];

sum= sum + a[5];

sum= sum + a[6];

sum= sum + a[7];

sum= sum + a[8];

sum= sum + a[9];

printf("sum is %d", sum);

return 0;

}

Figure 5.17
CPE performance for
different degrees of loop
unrolling. Only integer
addition and multiplication
improve by loop unrolling.
CPE
6.00
5.00
4.00
3.00
2.00
1.00
0.00
◇
U
U
X
T
--
A
X
T
2
A
0
>
T
T
3
4
Unrolling factor K
U
<<
←
5
Section 5.8 Loop Unrolling 511
double *
float *
float +
int *
O
►
- CO
0
^
Xint +

Expert Solution

Step by step

Solved in 3 steps with 1 images

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, computer-science and related others by exploring similar questions and additional content below.

Similar questions