Q23. The following program negates a 2D array. int sum_array(int a [N] [M]) { int i, j; for (i=0; i
Q23. The following program negates a 2D array. int sum_array(int a [N] [M]) { int i, j; for (i=0; i
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
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Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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![Q23. The following program negates a 2D array.
int sum_array(int a[N] [M]) {
int i, j;
for (i=0; i<M; i++)
for(j=0; j<N; j++)
a[j] [i] = -a[j][i];
Why does this program cannot exploit memory hierarchy?
Rewrite the program such that it can exploit the memory hierarchy and thus become
faster.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F19bd70ce-0d3e-41b7-b163-888a4964b3e6%2F8d251b9f-9c25-4e54-baa5-c03a89460a87%2F28yg9g_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Q23. The following program negates a 2D array.
int sum_array(int a[N] [M]) {
int i, j;
for (i=0; i<M; i++)
for(j=0; j<N; j++)
a[j] [i] = -a[j][i];
Why does this program cannot exploit memory hierarchy?
Rewrite the program such that it can exploit the memory hierarchy and thus become
faster.
![923
int a [2] [3] is stored
the memory.
elements along
If you access.
the
а лош,
then the program benefits from spatial locality,
elements
In the above example code, the
"column major" order. So,
A matrix
лошо-тајол
such as
order
accessed
from spatial locality,
✓
Column-major access can't exploit
spatial locality,
doesn't
are
benefit
Radboud Universiteit](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F19bd70ce-0d3e-41b7-b163-888a4964b3e6%2F8d251b9f-9c25-4e54-baa5-c03a89460a87%2Fz1c7n0f_processed.jpeg&w=3840&q=75)
Transcribed Image Text:923
int a [2] [3] is stored
the memory.
elements along
If you access.
the
а лош,
then the program benefits from spatial locality,
elements
In the above example code, the
"column major" order. So,
A matrix
лошо-тајол
such as
order
accessed
from spatial locality,
✓
Column-major access can't exploit
spatial locality,
doesn't
are
benefit
Radboud Universiteit
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