Time of execution on Linux:
real 0m0.004s
user 0m0.000s
sys 0m0.004s
Which of these I should consider?
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And according to this article:
real: The total elapsed time between start and end of the program.
user: The user CPU time that the program used. This includes all user mode library calls that the program made.
sys: The system CPU time that the program used. This includes only the kernel system calls and not any user library calls.
So in your output, the real time is 4 milliseconds, the user time is 0 milliseconds and the system time is 4 milliseconds. In most cases, what you are looking for is the real time, which is the total execution time in seconds for the application to run.
Hope you understood…! 