Multiprocessing
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Multiprogramming
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| It refers to processing of multiple processes at same time by multiple CPUs. | Keeps several programs in main memory at the same time and execute them concurrently utilizing single CPU. |
| It utilizes multiple CPUs. | It utilizes single CPU. |
| Occurs by means of parallel processing. | Occurs by switching from one process to others (a phenomenon called context switching). |
| It is possible for a system to simultaneously work on several program segments of one or more program. | It includes executing a portion of the program, then a segment of another in the consecutive time period |
| More expensive. | Less expensive. |
| More efficient. | Less efficient. |
| Take less time to execute the process. | Take more time to execute the process. |
| It permits parallel processing. | Context switching takes place. |
| It is used Parallel operating system. | It is used Batch operating system. |
