Separate HTML for Basic Foil 26 What does the Laplace Update calculation look like?

Basic HTML version of Foils prepared 2 October 1995

Foil 26 What does the Laplace Update calculation look like?

From New CPS615 Foils-- D 23 September 95 CPS615 Basic Simulation Track for Computational Science -- Fall Semester 95. by Geoffrey C. Fox

In the sequential code, a single processor updates in turn (16x16=256-60=196) internal points. Each update is j --> 0.25 *(j up + jdown + jleft + jright ) involves 4 floating point operations for each point

In the parallel case, each processor updates in turn the points for which it is responsible - this is "owner computes rule"

A corner processor updates nine points

(the small internal points)

A "general" central processor

updates sixteen points