Separate HTML for Scripted Foil 19 Passing Distributed Arrays as Subprogram Arguments in HPF

Scripted HTML version of Foils prepared 27 December 1996

Foil 19 Passing Distributed Arrays as Subprogram Arguments in HPF

From CPS615-Align and Distribute in HPF Delivered Lectures of CPS615 Basic Simulation Track for Computational Science -- 1 October 96. by Geoffrey C. Fox *

Secs 283.6

There are three typical cases:

Subroutine requires data to use a particular mapping determined by subroutine

Arguments must be remapped

Subroutine can use any mapping so actual argument should be passed and used with current mapping

Here we have two cases depending on whether programmer knows or not (and tells subroutine) what incoming distribution is

Sometimes we need to remap due to array sections being passed

Any remappings must be undone on return from subroutine

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