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Ivanyi A. (ed.) Algorithms of informatics, vol.2.. purposes (2007)(ISBN 9638759623)

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Such a method is will-suited for many distributed systems that must continue computation at all times. This section discusses how one can compute global state that is quite intuitive, yet consistent, in a precise sense. We rst discuss a distributed algorithm that imposes a global order on instructions of processors. This algorithm creates the illusion of a global clock available to processors. Then we introduce the notion of one instruction causally aecting other instruction, and an algorithm for computing which instruction aects which.

Distributed Algorithms that are causally aected by instructions that are not recorded in the cut. Such cuts we consider not consistent and so undesirable. Formally, a cut K = (k1 , . . , kn ) is inconsistent when there are processors pi and pj such that the instruction number ki of processor pi is causally aected by an instruction subsequent to instruction number kj of processor pj . So in an inconsistent cut there is a message that crosses the cut in a backward direction. Any cut that is not inconsistent is called a consistent cut .

Consistent state The happens before relation can be used to compute a global state of distributed system, such that this state is in some sense consistent. Shortly, we will formally dene the notion of consistency. Each processor executes instructions. A cut K is dened as a vector K = (k1 , . . , kn ) of non-negative integers. Intuitively, the vector K denotes the states of processors. Formally, ki denotes the number of instructions that processor pi has executed. Not all cuts correspond to collections of states of distributed processors that could be considered natural or consistent.

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