In this exercise we look at memory locality properties of matrix computation. Th e following code is written in C, where elements within the same row are stored contiguously. Assume each word is a 32-bit integer.

for (I=0; I<8; I++)

for (J=0; J<8000; J++)

A[I][J]=B[I][0]+A[J][I];

References to which variables exhibit temporal locality?

Question

Rocket

Computers & Technology

27 October, 23:07

In this exercise we look at memory locality properties of matrix computation. Th e following code is written in C, where elements within the same row are stored contiguously. Assume each word is a 32-bit integer.

for (I=0; I<8; I++)

for (J=0; J<8000; J++)

A[I][J]=B[I][0]+A[J][I];

References to which variables exhibit temporal locality?

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Answers (1)

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Matthias Wright · Answer 1

temporal locality can be defined as: when a particular memory is referenced or accessed several times within a specific period of time. In the question, i think the variable that exhibit temporal locality are I, J and 0 (all the variable). This is because the variable J and 0 are accessed several times within the loop. I would not have been part of it, but in the A[I][J]=B[I][0]+A[J][I], the variable "I" is also accessed in the addition. this is why it is part of the temporal locality.