Editing Consistency model (section)

== Transactional memory models ==
Transactional memory model<ref name="RelaxedModel"/> is the combination of cache coherency and memory consistency models as a communication model for shared memory systems supported by software or hardware; a transactional memory model provides both memory consistency and cache coherency. A transaction is a sequence of operations executed by a process that transforms data from one consistent state to another. A transaction either commits when there is no conflict or aborts. In commits, all changes are visible to all other processes when a transaction is completed, while aborts discard all changes. Compared to relaxed consistency models, a transactional model is easier to use and can provide higher performance than a sequential consistency model.