Cpu time vs wall clock time.
Wall clock time vs cpu time.
2 3 there is an interest because a significative difference between the executiontime and the clocktime is a sign of a slow calculation.
In other words it is the difference between the time at which a task finishes and the time at which the task started.
The wall clock time.
1 there isn t much to add there the executiontime is the time spent by the processor and the clocktime is the wall clock time or real time if you prefer.
The operating system cpu time due to system calls from the process.
Another important concept is the so called system time which is measured by the system clock.
This time doesnt include waiting for input output operations.
The wall clock time is also called elapsed or running time.
Compared to the cpu time the wall clock time is often longer because the cpu executing the measured program may also be executing other program s instructions at the same time.
The difference in wall and cpu time is rather large for this task clocking in at 35 237 seconds which was time sliced out to other processes.
The cpu time is often measured in clock ticks or as a percentage of the cpu capacity.
Wall clock time cpu time unless you have multiple cpus.
Cpu time process time is the amount of time cpu spends processing instructions of a program.
In this case the wall clock time was higher than the cpu time so that suggests the process spent a bunch of time waiting 58ms or so rather than doing computation the.
Youngwinston mar 7 2011 11 31 pm in response to ejp ejp wrote.
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.
The reference to a wall clock is how the term originally got its name.
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It used to be chargeable that s why it was tracked.
The reason being is because of the time it takes to print over 50 000 files to the screen therefore the linux kernel s scheduler was free to give more time slices to other processes.
The process cpu time.
Cpu time is time spent in the cpu doing actual work as opposed to waiting or not being scheduled.
Wall time is thus different from cpu time which measures only the time during which the processor is actively working on a certain task.
