In computing, elapsed real time, real time, wall-clock time, wall time, or walltime is the actual time taken from the start of a computer program to the end. In other words, it is the difference between the time at which a task finishes and the time at which the task started.

Wall time, also called real-world time, clock time, wall-clock time or -- more accurately -- elapsed real time, is the amount of time that a program or process takes to run from start to finish as measured by a person.

Aug 1, 2019 · There are a variety of answers, but in this article I’m going to cover what is probably the simplest heuristic: comparing CPU time and wallclock time. I’ll start with showing how to measure it across the full run of your process, and then demonstrate how you can measure it with Python over time.

If you're writing multi-threaded code and want to measure how well you're distributing your code across processors/cores, you'll probably measure both CPU time and wall time, and compare the two. If, for example, you have 4 cores available, your ideal would be …

The wall-clock time is not the number of seconds that the process has spent on the CPU; it is the elapsed time, including time spent waiting for its turn on the CPU (while other processes get to run).

Jul 31, 2009 · Wall clock time is the time you would get if you measured the runtime with a stopwatch. User time is the amount of time the CPU takes for running exclusively the code in your job (this does not include system calls you job may do).

Oct 12, 2020 · Today, we’d like to teach you about a special metric offered in this toolkit: the wall clock time responsibility (WCTR). It can be used to estimate how much time is really spent by each activity in your build, even in the presence of parallelism.

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Feb 18, 2021 · If the contents of the message become irrelevant after a certain period, use the -t (--timeout) option to limit the time during which the system attempts to deliver the message: wall -t [time-in-seconds] [message-text]

Wall-clock time is the time that a clock on the wall (or a stopwatch in hand) would measure as having elapsed between the start of the process and “now”. Elapsed time may be negative due to: change in the OS clock if your function doesn't return a monotic time.