Multitasking definitions

mŭl'tē-tăs'kĭng, -tī-
The concurrent operation by one central processing unit of two or more processes.
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The execution by a single central processing unit of two or more programs at once, either by simultaneous operation or by rapid alternation between the programs.
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The engaging in more than one activity at the same time or serially, switching one's attention back and forth from one activity to another.
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The act or an instance of performing various tasks more or less simultaneously.
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The concurrent operation by one central processing unit of two or more processes.
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The running of two or more programs in one computer at the same time. The number of programs that can be effectively multitasked depends on the sophistication of the operating system, the speed of the CPU and the speeds and capacities of memory (RAM) and storage. See preemptive multitasking.Input/Output vs. ProcessingPrograms can run simultaneously in the computer because of the difference between I/O and processing speed. While one program is waiting for input, instructions in another can be executed. During the milliseconds one program waits for data to be read from storage, millions of instructions in another program can be executed. Thousands of instructions can be executed in one program between each keystroke in another program.Channels and MulticoreIn mainframe architectures, multiple I/O channels allow for simultaneous I/O operations to take place. Multiple streams of data, sometimes hundreds, are being read and written at the exact same time. In a multicore CPU, one program can be running in one core while another is multitasked in another core, and so on (see multicore).Multitasking May Be Just Task SwitchingVery often, people think multitasking is occurring when what is really taking place is "task switching." Multitasking implies simultaneous operation; for example, while the user interacts with the program on screen, a program in the background is processing data.However, when several programs reside in memory (RAM) and do nothing but wait to be "front and center" again, the user is switching between programs (between apps, between tasks). See task switching.A Note on Ancient TerminologyIn the 1960s, the days of only mainframes, multitasking was called "multiprogramming," and multitasking meant "multithreading." See multithreading.
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