Fortran Wiki
cpu_time

Description

Returns a real value representing the elapsed CPU time in seconds. This is useful for testing segments of code to determine execution time.

If a time source is available, time will be reported with microsecond resolution. If no time source is available, time is set to -1.0.

Note that time may contain a, system dependent, arbitrary offset and may not start with 0.0. For cpu_time, the absolute value is meaningless, only differences between subsequent calls to this subroutine, as shown in the example below, should be used.

Standard

Fortran 95 and later

Class

Subroutine

Syntax

call cpu_time(time)

Arguments

time - The type shall be real with intent(out).

Return value

None

Example

program test_cpu_time
    real :: start, finish
    call cpu_time(start)
        ! put code to test here
    call cpu_time(finish)
    print '("Time = ",f6.3," seconds.")',finish-start
end program test_cpu_time

Fortran Wiki cpu_time