Differentiate between Multi-Programming and Multi-Threading

Q1. Differentiate between Multi-Programming and Multi-Threading.

Ans.

Multi Programming Multi Threading
1. Multiprogramming is a rudimentary form of parallel processing in which several programs are run at the same time on one processor. 1. Multi-threading is the ability of a program or an operating system process to manage its use by more than one user at a time.
2. Since there is only one processor, there can be no true simultaneous execution of different programs. 2. Even manage multiple requests by the same user without having to have multiple copies of the program running in the computer.
3. Instead the operating system executes part of one program, then part of another, and so on. 3. In some situation a single application may be required to perform several similar tasks.
4. To the user it appears that all programs are executing at the same time. 4. Example as web server accepts client requests for web pages, images, sound and so forth. A busy web server may have several of clients. Concurrently accessing it, if the web server runs as a traditional single-threaded process, it would be able to service only one client at a time. The amount of time that a client might have to wait for its request to be serviced could be enormous.
5. The operating system selects a job from the job pool and starts executing a job, when that job needs to wait for any input/output operations the CPU are switched to another job. So the main idea here is that the CPU is never idle. 5. Resources sharing economy and utilization of multiprocessor architectures multi-threading concept can be used.

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