(c) Consider the following two C functions sum2Darray1 and sum2Darray2. Both of them compute the sum of all the elements of an input 2-dimensional matrix. Which one of them will be able to exploit memory hierarchy and thus achieve faster com- putation time? Explain your answer. 1 int sum2Darray1 (int a [N] [M]) 2 { 3 4 5 6 780 8} int i, j, sum=0; for(i=0; i

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Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
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Chapter1: Introduction
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(c) Consider the following two C functions sum2Darray1 and sum2Darray2. Both of
them compute the sum of all the elements of an input 2-dimensional matrix. Which
one of them will be able to exploit memory hierarchy and thus achieve faster com-
putation time? Explain your answer.
1 int sum2Darray1 (int a [N] [M])
2 {
3
4
5
6
7
8
int i, j, sum=0;
for(i=0; i<M; i++)
for(j=0; j<N; j++)
sum sum + a[j] [i];
return sum;
1 int sum2Darray2 (int a [N] [M])
2 {
3
4
5
6
7
8}
int i, j, sum=0;
for(i=0; i<n; i++)
for(j=0; j<M; j++)
sum sum + a[i][j];
return sum;
Transcribed Image Text:(c) Consider the following two C functions sum2Darray1 and sum2Darray2. Both of them compute the sum of all the elements of an input 2-dimensional matrix. Which one of them will be able to exploit memory hierarchy and thus achieve faster com- putation time? Explain your answer. 1 int sum2Darray1 (int a [N] [M]) 2 { 3 4 5 6 7 8 int i, j, sum=0; for(i=0; i<M; i++) for(j=0; j<N; j++) sum sum + a[j] [i]; return sum; 1 int sum2Darray2 (int a [N] [M]) 2 { 3 4 5 6 7 8} int i, j, sum=0; for(i=0; i<n; i++) for(j=0; j<M; j++) sum sum + a[i][j]; return sum;
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