What are some examples of memory ordering models?

What are some examples of memory ordering models?

Memory ordering models define how operations on memory are seen by different threads. Examples include Sequential Consistency, Total Store Order, and Release Consistency.

Can you explain Sequential Consistency in more detail?

Sequential Consistency ensures that the result of execution is the same as if all operations were executed in some sequential order, and the operations of each individual process appear in this sequence in the order issued.

What about Total Store Order?

Total Store Order allows writes to be seen in the same order by all threads, but reads can be seen in different orders. This model is often used in multiprocessor systems.

How does Release Consistency differ from these models?

Release Consistency allows more flexibility by only enforcing order on synchronization operations, meaning that non-synchronization operations can be reordered freely.