Fortran Wiki
cpu_time (changes)

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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

~~(削除) Fortran 95 and later (削除ここまで)~~(追記) Fortran 95 (追記ここまで)(追記) and later (追記ここまで)

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 (changes)