What is memory coherence?

memory coherence is a problem that occurs on a computer when the processor tries to look at the memory sector. This problem only occurs on multi -core systems or computers that have more than one central processing unit (CPU). When multiple processors look at the same memory sector and update this sector, the other can be left with an old version of the computer's memory. To solve this problem, consistency rules are used to ensure that processors do not have access to the same memory or that updates are consistent between them. There are several different models of consistency, so programmers and computer developers must know the exact model. When one CPU approaches the memory sector, it is able to take, use and change memory without any conflict, because there are no other hardware pieces that compete for memory. If two processors are used, the CPU can catch the same memory sector. Although there are no problems with two processoRYM memory sharing, a problem arises if one CPU updates the memory. This leaves the second CPU with an outdated memory that, if it remains unprocessed, can cause the entire computer to have two separate and conflicting versions of the computer's memory.

There are programming schemes made specifically for repairing memory coherence, which can be the main problem. They are known together as the rules of memory consistency and there are many versions. Overall, each version tells more CPU how to correctly share your computer memory without causing memory coherence. This can be done by updating both versions of memory when one version changes or prevents CPU access from accessing the same memory simultaneously.

When using the rules of consistency, it helps to avoid the problem of memory coherence, and further this is Blem. Each set of consistency has different programming and different rules, so programmers who createThey are leaving programs or writing code that deal directly with the CPU, they will have to adapt coding for the exact rules of consistency. If this is not the case, it can either suppress consistency or cause the main conflict between the programmer encoding and the rules of consistency and the computer may stop working.