Intel® Fortran Compiler Classic and Intel® Fortran Compiler Developer Guide and Reference

ID 767251
Date 3/22/2024
Public

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Document Table of Contents

DCLOCK

Portability Function: Returns the elapsed time in seconds since the start of the current process.

Module

USE IFPORT

result = DCLOCK( )

Results

The result type is REAL(8). This routine provides accurate timing to the nearest millisecond (Windows*) or to the nearest microsecond (Linux*), taking into account the frequency of the processor where the current process is running.

Note that the first call to DCLOCK performs calibration.

Example

USE IFPORT
DOUBLE PRECISION START_TIME, STOP_TIME
START_TIME = DCLOCK()
CALL FOO()
STOP_TIME = DCLOCK()
PRINT *, 'foo took:', STOP_TIME - START_TIME, 'seconds.'