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Questions about the optimisation problem of ordering a set of tasks so that some objective function (e.g. makespan) is minimised. The set of constraints is crucial; in particular, there is a large body of research covering online variants. Use the process-scheduling tag for questions specifically about scheduling in operating systems.

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Default scan order in SCAN and LOOK disk scheduling algorithms

There is no specific order. In SCAN, C-SCAN, LOOK and C-LOOK we have to start moving towards the closest cylinders as in SSTF or you can start moving towards a direction in which there are less number …
Ritika Gupta's user avatar
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SCAN and CSCAN algorithms of disk scheduling

SCAN works like an elevator does. It scans down towards the nearest end and then when it hits the bottom it scans up servicing the requests that it didn't get going down. If a request comes in after i …
Ritika Gupta's user avatar