Lamport Clock
Companies that have a group of computers connected by an interconnection network will often desire a way to devise an operating system which will (Distributed systems; distributed coordination):
Manage the resources of the network as a whole
Appear to users as a single operating system or a "virtual uniprocessor."
In particular, a company may wish to treat the multiple central processing units (CPUs) as a system resource so that an application can take advantage of available CPU cycles on any machine. This task is challenged by the lack of shared memory that distinguishes distributed systems from multiprocessor systems. However, processes can communicate by a reliable message protocol and a technique known as a Lamport clock invented in 1978 by Leslie Lamport that can be used to sort a set of distributed system events into a partial order.
To understand the Lamport clock technique, it's useful to first review characteristics of a computer clock. A hardware clock in a computer is a device which generates interrupt signals periodically (Clocks, timestamps and ordering in distributed systems). An interrupt routine increments a time counter which has been initialized by an operator to an initial time that is more than likely different on each computer. And, timers on different computers run at slightly different rates. Thus, ordering events in decentralized systems is complex....
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