Elapsed real time real time wall clock time or wall time is the actual time taken from the start of a computer program to the end.
Wall clock time c.
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A program was running for 10 seconds and used 4 seconds of cpu time.
Great britain united kingdom is one hour ahead of utc during summer.
The 10 seconds there is wall clock time the 4 seconds isn t.
For example if the cpu is shared by other processes std clock time may advance slower than wall clock.
A clock consists of a starting point or epoch and a tick rate.
Mpj wall clock time usually refers to time intervals.
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For example a clock may have an epoch of january 1 1970 and tick every second.
Monday september 14 2020 at 12 29 33 utc is coordinated universal time gmt is greenwich mean time.
Clocks time points durations clocks.
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C defines several clock types.
Std clock time may advance faster or slower than the wall clock depending on the execution resources given to the program by the operating system.
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In other words it is the difference between the time at which a task finishes and the time at which the task started.
If the elapsed time is unavailable or has exceeded the maximum positive time that can be recorded as a clock t type the function returns the value clock t 1.
If you stipulate any particular t1 then wall clock time is within the scope of iso c.
Wall time is thus different from cpu time which measures only the time during which the processor is actively working on a certain task.
The clock function tells how much wall clock time has passed since the crt initialization during process start.