Localization and size of the data block (Locality and value block size)
If you get the storage information for location A, you will probably soon need to get the storage information around a. This is natural and applies to both data access and command access.
An example of a command read:
CPU directives are usually read sequentially from memory (except for jump and branch operations). If you get the command of location A, you will probably also need to read the a+4,a+8,a+12 and so on location information.
Caching can further exploit the advantages of localization by expanding data blocks. Each time a cache Miss is made to the data of a address, it will be stored in a piece of data (including a).
When we decide on the size of the data block, we need to do some performance balancing. Too big or too small to fit.
Virtual Memory Technology