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changed text on BoomerAMG defaults

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This commit is contained in:
Ulrike Yang 2016-08-04 17:42:47 -07:00
parent 73dceda9ee
commit 0d29dde10a
1 changed files with 6 additions and 2 deletions
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8
src/docs/usr_solvers.tex
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@ -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