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Representation of a FIFO queue. In computing and in systems theory, first in, first out (the first in is the first out), acronymized as FIFO, is a method for organizing the manipulation of a data structure (often, specifically a data buffer) where the oldest (first) entry, or "head" of the queue, is processed first.
The use of FIFO is a response to the precarity of resource extraction sectors: the workers can be shipped in quickly during resource booms and sent away during busts. [4] Usually, a fly-in fly-out job involves working a long shift (e.g., 12 hours each day) for a number of continuous days with all days off spent at home rather than at the work site.
Multiple FIFO queues are used and the operation is as follows: A new process is inserted at the end (tail) of the top-level FIFO queue. At some stage the process reaches the head of the queue and is assigned the CPU. If the process is completed within the time slice of the given queue, it leaves the system.
The operations of a queue make it a first-in-first-out (FIFO) data structure. In a FIFO data structure, the first element added to the queue will be the first one to be removed. This is equivalent to the requirement that once a new element is added, all elements that were added before have to be removed before the new element can be removed.
It has since been extended to A/S/c/K/N/D where K is the capacity of the queue, N is the size of the population of jobs to be served, and D is the queueing discipline. [ 2 ] [ 3 ] [ 4 ] When the final three parameters are not specified (e.g. M/M/1 queue ), it is assumed K = ∞, N = ∞ and D = FIFO .
FIFO in stock rotation, particularly to avoid food spoilage; FIFO (computing and electronics), a method of queuing or memory management Queue (abstract data type), data abstraction of the queuing concept; FIFO and LIFO accounting, methods used in managing inventory and financial matters
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A backup rotation scheme is a system of backing up data to computer media (such as tapes) that minimizes, by re-use, the number of media used.The scheme determines how and when each piece of removable storage is used for a backup job and how long it is retained once it has backup data stored on it.