Portability Function: Returns the elapsed time in seconds since the start of the current process.
result = DCLOCK( )
The result type is REAL(8). This routine provides accurate timing to the nearest millisecond (Windows*) or to the nearest microsecond (Linux* and Mac OS* X), taking into account the frequency of the processor where the current process is running.
Note that the first call to DCLOCK performs calibration.
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