In this model, tasks share a single memory area in which we can read and write asynchronously. There are mechanisms that allow the coder to control the access to the shared memory; for example, locks or semaphores. This model offers the advantage that the coder does not have to clarify the communication between tasks. An important disadvantage, in terms of performance, is that it becomes more difficult to understand and manage data locality. This refers to keeping data local to the processor that works on conserving memory access, cache refreshes, and bus traffic that occurs when multiple processors use the same data.