Subroutine TIMEIT

The only other operating system-dependent part of DDSCAT.5a is the single subroutine TIMEIT. Several versions of TIMEIT are provided:

• timeit_sun.f uses the SunOS system call etime
• timeit_convex.f uses the Convex OS system call etime
• timeit_cray.f uses the system call second
• timeit_hp.f uses the HP-AUX system calls sysconf and times
• timeit_ibm6000.f uses the AIX system call mclock
• timeit_osf.f uses the DEC OSF system call etime
• timeit_sgi.f uses the IRIX system call etime
• timeit_vms.f uses the VMS system calls LIB$INIT_TIMER and LIB$SHOW_TIMER
• timeit_titan.f uses the system call cputim
• timeit_null.f is a dummy routine which provides no timing information, but can be used under any operating system.

You must compile and link one of the timeit_xxx.f routines, possibly after modifying it to work on your system; timeit_null.f is the easiest choice, but it will return no timing information.