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What is difference among multiprograming,timesharing,and multitasking?

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Multiprogramming is a form of parallel processing on a single processor - or uniprocessor. Basically the operating system executes part of a one program, then part of another, and so on. It does it so quickly it seems to you and I that the programs are all being executed at once when in fact they are executed one at a time in parts to appear that way.

Timesharing is a very old system that basically used a special terminal that connected to a Central computer that offered a full operating system for the user to take advantage of. The users were charged for the time they were connected, the files stored and I believe a flat rate per month on top of that.

Multitasking is schedules what processes or tasks are to be running at any given time as well as when a waiting process will be scheduled to run. This allows the illusion of parrell processing, much like multiprogramming.

Posted on Dec 16, 2008

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What is the basic difference between multitasking multiprogrammin


I would have expected that you would be asking the difference between
multithreading and parallel processing, which is simply a matter of using
sequential processor [multithreading] to simulate simultaneous data streams from multiple processors [parallel processing] while the terms you did inquire concerning are various terms of varying complexity which refer to the simultaneous accomplishment of various tasks.

A multithreading processor alternates the application of tasks to alternating clock cycles of the same processor.

A parallel processor has a matrix of multiple processors assigned to diverse tasks with streaming data from each clock cycle of the same processor for the same task.

multitasking simply means the simultaneous accomplishment of multiple tasks by any means including cyber or human.

Multiprogramming is the simultaneous operation of various alogorithms
where none are halted to allow the others to proceed, which process can be accomplished through with either parallel processors or a multithreaded processor.

Prior to the existence of multiple processors in a single CPU (ex. Core Duo) or even Multithreaded Processors [Pentium Four, PPC], certain types of looping algorithmic methods could be applied [and this programmer did apply such] to multiple tasks to create
the appearance that the tasks were accomplished simultaneously.
The latter was more of a Trompe l'Oeil


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Q&a


I have never heard of multiprograming, time sharing is when you time share CPU time. (I.E. you have two programs and one program uses the CPU and when the first program isn't processing the second program is using the CPU to process its program). Multitasking is when two programs run at the same time on one CPU.

Hope that at least answered some of your question. Thank you for the request.

Nov 14, 2008 | Computers & Internet

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