Time - Wall Clock

About

Wall-clock time, or wall time is a duration that measure the time from the start to the completion of a task.

Synonym:

  • elapsed real time
  • real time
  • elapsed time

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:

  • leap second for instance if your process goes in millisecond
  • change in the OS clock if your function doesn't return a monotic time.

When using a non-monotonic clock source is to always check whether the elapsed time is negative.

Computer

In the context of a task being performed on a computer, wall-clock time is a measure of the real time that elapses from start to end, including:

  • time that passes due to programmed (artificial) delays
  • or waiting for resources to become available.

Wall-clock_time is is the difference between the time at which a task finishes and the time at which the task started.

Documentation / Reference





Discover More
Cpu Process Explorer Perf
CPU - (CPU|Processor) Time Counter

Cpu time The count of cycles, also known as clockticks, forms the basis for measuring how long a program takes to execute. See: How do you measure Execution Time? CPU Time Running which code...
Time - (Duration, Elapsed Time, Period, Interval)

A duration is the period of time between two event occurrences, computed as the difference of the time coordinates of those events. A duration is an amount of time that may be expressed in terms of unit...
Time - Clock

Modern timekeeping is based on atomic clocks. See also:
What's the Date HTTP Header ?

The date header is the wall_clock of the response message just before it was send.



Share this page:
Follow us:
Task Runner