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Ifpack2 BlockTriDiContainer - various improvements on the line solver.

James Willenbring requested to merge kyungjoo-kim:ifpack2-develop into develop

Created by: kyungjoo-kim


This PR includes improvements on the Ifpack2 BlockTriDiContainer. Previously,

  • the block tridiagonal solve is separated from conversion of multivector between packed and flat formats.
  • the conversion routine is fused with norm calculation.
  • this inefficiently use team parallelism.


  • the block tridiagonal solve is fused with multivector conversion routine.
  • norm caculation is done on a tpetra multi vector with a range policy.

Motivation and Context

This solves slowness in computing norms for stopping the fixed pointer iterations.

How Has This Been Tested?


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