Massively Parallel Processing(MPP) VS
Symmetical Multi-Processor(SMP)
MPP is a System Architecture that presumes each processor has its own RAM and that other processors can't access it.
Each processor is presumed to operate as an autonomous system that has mechanism for coordinating work with other processors - typically message bus.
SMP is a system Architecture that presumes two or more processors access the same shared RAM.
To do so, Synchronization mechanisms, (typically semaphones) are used to coordinate access between processes running in competing CPUs.
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