16. Support for NUMA and CMT Hardware
Sun historically built symmetric multiprocessor (SMP) machines in which all of memory was seen as a single pool, equidistant in terms of latency from the set of independent, identical CPUs. Thus, the memory hierarchy from the core of the CPU through the various on- and off-chip caches, buses, etc., to main memory was identical for all the CPUs in the machine. In addition, any components that were shared were shared by all the CPUs in the same manner.
Newer systems depart from this relatively straightforward architecture in two fundamental ways. The first type are machines in which some memory is closer to some CPUs than others. These are known ...
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