A portable vector-code for autonomous multigrid modules. With a discussion
Piet Hemker, Pieter Wesseling, P.M. deZeeuw · Centrum Wiskunde & Informatica (CWI), the national research institute for mathematics and computer science in the Netherlands · 1984
The implementation is described of two multigrid algorithms for use as standard subroutines for the efficient solution of linear systems that arise from 7-point discretizations of elliptic PDEs on a rectangle.For both algorithms a tuned scalar-version and a tuned vector-version have been constructed and run on a CYBER 170, a CRAY I and a CYBER 205.The CPU-times are given and compared.The implementation is available in portable ANSI-FORTRAN.