Is there a general way to detect the differences among the different types of consistency models?
A13.1: Yes! Think in terms of the perspective of a single processor. For example, if you have 3 processors, each processor may have a different perspective for reads and writes. In sequential consistency, all processors see reads and writes in a global order of occurrence. For causal consistency, all processors following a sequence of (write-)read-write must read affected variable values in the same order. For PRAM consistency, an active (non-spinning) processor can see any writes in any order from any other active processor. For PC consistency, an active (non-spinning) processor can see any writes in any order from any other active processor as long as the writes from each processor follow the ordering given in its respective processor. For weak consistency, the only writes that must be seen are the last ones that occurred before the synchronization of a processor. Also, the other processor(s) doing any type of read only has to acknowledge that write if it has already performed synchr
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