I am learning Sequential Consistency in Distributed Systems but just could not understand the terms explained. I would appreciate if someone can shed some light in layman's term on why (a) and (c) below are sequentially consistent and (b) is not.
Thanks.
Sequential Consistency in Distributed Systems
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An execution
eof operations is sequentially consistent if and only if it can be permutated into a sequencesof these operations such that:the sequence
srespects the program order of each process. That is, for any two operationso1ando2which are of the same process and ifo1precedeso2ine, theno1should be placed beforeo2ins;in the sequence
s, each read operation returns the value of the last preceding write operation over the same variable.For (a),
scan be：W(x)b [P2], R(x)b [P3], R(x)b [P4], W(x)a [P1], R(x)a [P3], R(x)a [P4]For (c),
scan be:W(x)a [P1], R(x)a [P2], R(x)a [P3], R(x)a [P4], W(x)b [P3], R(x)b [P1], R(x)b [P2], R(x)b [P4]However, for (b):
the operations
R(x)b, R(x)afromP3require thatW(x)bcome beforeW(x)athe operations
R(x)a, R(x)bfromP4require thatW(x)acome beforeW(x)bIt is impossible to construct such a sequence
s.