Does calling an element of an array calls the whole array
 

I am working on code to multiply matrices of higher dimensions eg. 10000x10000.
Code is working, but i want to reduce the time elapsed as much as possible.

So i used Cannon's Matrix Multiplication algorithm, (In this algorithm Matrix is divided into partitions of smaller size, as 5,10,20,100 or whatever we want). I have a doubt that whenever i access any partition(element) of that 2d array, Does the whole row or column of that 2d array is fetched to memory or cpu ? Or only that specific partition(element) is fetched ?

If the whole row or column is fetched. Suggest some ways to fetch only that specific partition(element). Can vectors do that? Or i have to create N smaller 2d matrices (N = number of partitions) and copy data of matrix into smaller matrices.

PS: This seems to be part of Computer Architecture to me.

It depends on your code.
library: blas?
Usually it should be about distributing tasks to processors.

Well i am distributing partitions to different Processors. Coding OpenMP.

Moderator Response
 

Moved: This thread is more suitable in <Programming> and has been moved accordingly to help your thread/question get the exposure it deserves.