Discussion
One of the following is not a key characteristic of NUMA machines :
Answer: C
The statement that is not a characteristic of NUMA machines is (iii), access to remote memory is faster than access to local memory.
NUMA (non-uniform memory access) multiprocessors have three key characteristics: a single address space visible to all CPUs (i); access to remote memory through ordinary LOAD and STORE instructions (ii); and access to remote memory that is slower than access to local memory (iv). The non-uniformity is precisely that local memory is faster.
Statement (iii) contradicts (iv) and the very idea of NUMA, so it is the odd one out; the other three are true.
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