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Multiprogramming
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Multitasking
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Multithreading
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Multiprocessing
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In multiprogramming, multiple programs execute at the same time on a single device.
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In Multitasking, a single resource is used to process multiple tasks.
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Multithreading is a process divided into a number of sub-processes called threads. Each thread is independent and has its own path of execution with enabled inter-thread. Communication.
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In multiprocessing, multiple processing units are used by a single device.
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The process resides in the main memory.
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The process resides in the same CPU.
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More than one thread processed on a single CPU
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The process switches from one to another CPU as multiple processing units are used |
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Number of CPU uses one
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Number of CPU uses one
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The number of CPU Can be one or more than one
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Number of CPU uses more than one
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One process is executed at a time.
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One by one job is being executed at a time.
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Various components of the same process are being executed at a time.
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More than one process can be executed at a time
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| Throughput is less. |
Throughput is moderate.
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Throughput is moderate.
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Throughput is maximum.
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Category wise it is not further divided
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It is divided into Single User & Multiuser. |
Category wise it is not further divided
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It is divided in Symmetric & Asymmetric category |
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It uses batch OS. The CPU is utilized completely while executing.
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It is time-sharing as the task assigned switches regularly.
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The tasks are always further divided into sub-tasks.
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It carries multiple processors to execute the task.
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The processing is slower, as a single job resides in the main memory while executing.
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Multitasking follows the concept of context switching.
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It allows a single process to get multiple code segments.
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A large amount of work can be done in a short period of time.
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