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.
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An execution
e
of operations is sequentially consistent if and only if it can be permutated into a sequences
of these operations such that:the sequence
s
respects the program order of each process. That is, for any two operationso1
ando2
which are of the same process and ifo1
precedeso2
ine
, theno1
should be placed beforeo2
ins
;in the sequence
s
, each read operation returns the value of the last preceding write operation over the same variable.For (a),
s
can 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),
s
can 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)a
fromP3
require thatW(x)b
come beforeW(x)a
the operations
R(x)a, R(x)b
fromP4
require thatW(x)a
come beforeW(x)b
It is impossible to construct such a sequence
s
.