JargonFile/entries/wall time.txt

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wall time
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n. (also wall clock time ) 1. Real world time (what the clock on the wall
shows), as opposed to the system clock's idea of time. 2. The real running
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time of a program, as opposed to the number of ticks required to execute it
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(on a timesharing system these always differ, as no one program gets all the
ticks, and on multiprocessor systems with good thread support one may get
more processor time than real time).