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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

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)
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
Section: Chapter Questions
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.
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
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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