All the processors in the UMA model share the physical memory uniformly.
The UMA model is suitable for general purpose and time sharing applications by multiple users.
It can be used to speed up the execution of a single large program in time-critical applications.
[1] There are three types of UMA architectures: In April 2013, the term hUMA (heterogeneous uniform memory access) began to appear in AMD promotional material to refer to CPU and GPU sharing the same system memory via cache coherent views.
Advantages include an easier programming model and less copying of data between separate memory pools.