Intel® Fortran Compiler 16.0 User and Reference Guide
Portability Function: Returns the number of seconds that have elapsed since midnight, less the value of its argument. SECNDS can be used as a portability function or as an intrinsic procedure. It is an intrinsic procedure unless you specify USE IFPORT.
USE IFPORT
result = SECNDS (time)
time |
(Input) REAL(4). Number of seconds, precise to a hundredth of a second (0.01), to be subtracted. |
The result type is REAL(4). The result value is the number of seconds that have elapsed since midnight, minus time, with a precision of a hundredth of a second (0.01).
To start the timing clock, call SECNDS with 0.0, and save the result in a local variable. To get the elapsed time since the last call to SECNDS, pass the local variable to SECNDS on the next call.
USE IFPORT
REAL(4) s
INTEGER(4) i, j
s = SECNDS(0.0)
DO I = 1, 100000
J = J + 1
END DO
s = SECNDS(s)
PRINT *, 'It took ',s, 'seconds to run.'