Tutorial 3: Implement: Solvers

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Objectives

This tutorial will explain how to solve a system of equations using Ginkgo. You will learn about gko::solver::Cg class and its accompanying factory gko::solver::Cg::Factory. You will also learn about stopping criteria (gko::stop::Iterations and gko::stop::RelativeResidual).

The CG solver

In case you are not familiar with the conjugate gradient method, you can read up on it here.

In Ginkgo, to set up a cg solver, we first have to create a factory. That is done by

cg::build()
		.with_criteria(gko::stop::Iteration::build()
						   .with_max_iters(max_iters)
						   .on(exec),
					   gko::stop::ResidualNormReduction<>::build()
						   .with_reduction_factor(1e-6)
						   .on(exec))
		.on(exec);

Previous: [Implement: Matrices](./Tutorial-2:-Implement:-Matrices); Next: [Optimize: Measuring Performance](./Tutorial-4:-Optimize:-Measuring-Performance)

Ginkgo Library