Multiprocessors can be categorized into three shared-memory model which are:
- Uniform Memory Access (UMA)
- Non-uniform Memory Access (NUMA)
- Cache-only Memory Access (COMA)
Uniform Memory Access (UMA):
In UMA, where Single memory controller is used. Uniform Memory Access is slower than non-uniform Memory Access. In Uniform Memory Access, bandwidth is restricted or limited rather than non-uniform memory access. There are 3 types of buses used in uniform Memory Access which are: Single, Multiple and Crossbar. It is applicable for general purpose applications and time-sharing applications.
Non-uniform Memory Access (NUMA):
In NUMA, where different memory controller is used. Non-uniform Memory Access is faster than uniform Memory Access. Non-uniform Memory Access is applicable for real-time applications and time-critical applications.
Let’s see the difference between UMA and NUMA:
|1.||UMA stands for Uniform Memory Access.||NUMA stands for Non-uniform Memory Access.|
|2.||In Uniform Memory Access, Single memory controller is used.||In Non-uniform Memory Access, Different memory controller is used.|
|3.||Uniform Memory Access is slower than non-uniform Memory Access.||Non-uniform Memory Access is faster than uniform Memory Access.|
|4.||Uniform Memory Access has limited bandwidth.||Non-uniform Memory Access has more bandwidth than uniform Memory Access.|
|5.||Uniform Memory Access is applicable for general purpose applications and time-sharing applications.||Non-uniform Memory Access is applicable for real-time applications and time-critical applications.|
|6.||In uniform Memory Access, memory access time is balanced or equal.||In non-uniform Memory Access, memory access time is not equal.|
|7.||There are 3 types of buses used in uniform Memory Access which are: Single, Multiple and Crossbar.||While in non-uniform Memory Access, There are 2 types of buses used which are: Tree and hierarchical.|
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