From 0d29dde10a9a6644e69228cfd04960b2a85fe8a1 Mon Sep 17 00:00:00 2001 From: Ulrike Yang Date: Thu, 4 Aug 2016 17:42:47 -0700 Subject: [PATCH] changed text on BoomerAMG defaults --- src/docs/usr_solvers.tex | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/src/docs/usr_solvers.tex b/src/docs/usr_solvers.tex index bda018d36..adfd06b32 100644 --- a/src/docs/usr_solvers.tex +++ b/src/docs/usr_solvers.tex @@ -409,7 +409,7 @@ Various coarsening techniques are available: \begin{itemize} \item the Cleary-Luby-Jones-Plassman (CLJP) coarsening, \item the Falgout coarsening which is a combination of CLJP and the -classical RS coarsening algorithm (default), +classical RS coarsening algorithm, \item CGC and CGC-E coarsenings \cite{Griebela_1, Griebel_2}, \item PMIS and HMIS coarsening algorithms which lead to coarsenings with lower complexities \cite{DeSterck_Yang_Heys_2004} as well as @@ -420,10 +420,12 @@ aggressive coarsening (starting with the finest level) via \code{HYPRE_BoomerAMGSetAggNumLevels}. Since aggressive coarsening requires long range interpolation, multipass interpolation is always used on levels with aggressive coarsening, unless the user specifies another long-range interpolation suitable for aggressive coarsening. +Note that the default coarsening is HMIS \cite{DeSterck_Yang_Heys_2004}. + \subsection{Interpolation Options} Various interpolation techniques can be set using \code{HYPRE_BoomerAMGSetInterpType}: \begin{itemize} -\item the ``classical'' interpolation as defined in \cite{Ruge_Stueben_1987} (default), +\item the ``classical'' interpolation as defined in \cite{Ruge_Stueben_1987}, \item direct interpolation \cite{Stueben_1999}, \item standard interpolation \cite{Stueben_1999}, \item an extended ``classical'' interpolation, which is a long range interpolation and is recommended to be used with PMIS and HMIS coarsening for harder problems \cite{DeSterck_Falgout_Nolting_Yang_2008}, @@ -439,6 +441,8 @@ and recommended to control complexity and truncate the interpolation operators using \code{HYPRE_BoomerAMGSetTruncFactor} and/or \code{HYPRE_BoomerAMGSetPMaxElmts}, or \code{HYPRE_BoomerAMGSetJacobiTruncTheshold} (for Jacobi interpolation only). +Note that the default interpolation is extended+i interpolation \cite{DeSterck_Falgout_Nolting_Yang_2008} truncated to 4 elements per row. + \subsection{Non-Galerkin Options} In order to reduce communication, there is a non-Galerkin coarse grid sparsification option available \cite{FaSc2014}. This option can be used by