Multitasking is a method for multiple tasks to share a single resource, like a CPU. This is usually accomplished in software via special programming.
Multiprocessing is the use of multiple CPUs in the same computer and the method of splitting tasks between them. This is usually done with hardware on the motherboard.
* Multiuser: A computer system the can handle more then one user at a time. Windows is not a multiuser OS. It can handle only one user at a time. * Multitasking: The ability of an OS to do more then one thing at atime. for instance, you can be downloading a large file and still use another program to do something, like write a book. * Multiprocessing: The chip in new computers is able to do more then one task at a time because there is more then one processing unit on/in the chip.
Multiprocessing / multitasking Multiprocessing is the use of two or more processors in a single computer. to acheive greater throughput, economy of scale and increased reliability.Most multiprocessing systems use symmetric multiprocessing, SMP, (as opposed to asymmetric) where all processes share the processing load equally. Multitasking on the other hand is best explained by first defining what multiprogramming is. Multiprogramming is used to ensure the best effecient use of the CPU. Whenever a CPU is processing a program, which is loaded in memory, and it must wait for resources or I/O then it will sit idly which is a waste of the CPU. Multiprogramming will store a number of 'jobs' in a queue and whenever the CPU is waiting for I/O etc while executing a particular job, it will immediately open the next job in the queue and process that job until such time as it must wait again, and then it can select the next job in the queue or return to the previous job. In this way the CPU idle time is reduced. Multitasking is a logical extension of multiprogramming in that instead of waiting for a process to reach a stage where it must wait for I/O or some resource, it schedules time for each process that is loaded into memory, such that each process appears to the user to be running at exactly the same time.Another name for multitasking is timesharing.
Multithreading:Multithreading is a process of executing multiple threads simultaneously.The concept of threads provides a mechanism to make maximum utilization of CPU.Basically a thread is a light weight process.Both multithreading and multiprocessing are used to achieve multitasking.But multithreaing is more effective than multiprocessing because multithreading share common memory area but multitasking will allocate separate memory area for each and every process.Executing several tasks simultaneously is called multitasking. Multitasking is used for maximum utilization of cpu.Multitasking:Mutitasking is achieved in two ways:process based multitaskingThread based multitaskingfor more details go through this website
A symmetric multiprocessing (SMP) system is one in which each processor runs an identical copy of the operating system on each processor. In an asymmetric multiprocessing, system, each processor is assigned a specific tasks. An example of this would be a master- slave relationship between one processor and “the rest”.
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