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Fixed docs to provide examples of halo & ovrlap.

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Salvatore Filippone
2007-01-24 09:32:49 +00:00
parent ac77e56aa2
commit c591609d9b
5 changed files with 28 additions and 27 deletions
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docs/pdf/datastruct.tex
+18 -16
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@@ -281,26 +281,28 @@ like Diagonal Scaling or Block Jacobi with incomplete
factorization ILU(0).
A preconditioner is held in the \hypertarget{precdata}{{\tt
psb\_prec\_type}} data structure which depends on the
\verb|psb_base_prec| reported in
figure~\ref{fig:prectype}. The \verb|psb_base_prec|
psb\_prec\_type}} data structure reported in
figure~\ref{fig:prectype}. The \verb|psb_prec_type|
data type may contain a simple preconditioning matrix with the
associated communication descriptor which may be different than the
system communication descriptor in the case of parallel
preconditioners like the Additive Schwarz one. Then the
\verb|psb_prec_type| may contain more than one preconditioning matrix
like in the case of Two-Level (in general Multi-Level) preconditioners.
The user can choose the type of preconditioner to be used by means of
the \verb|psb_precset| subroutine; once the type of preconditioning
method is specified, along with all the parameters that characterize
it, the preconditioner data structure can be built using the
\verb|psb_precbld| subroutine.
This data structure wants to be flexible enough to easily allow the
implementation of new kind of preconditioners. The values contained in
associated communication descriptor.%% which may be different than the
%% system communication descriptor in the case of parallel
%% preconditioners like the Additive Schwarz one. Then the
%% \verb|psb_prec_type| may contain more than one preconditioning matrix
%% like in the case of Two-Level (in general Multi-Level) preconditioners.
%% The user can choose the type of preconditioner to be used by means of
%% the \verb|psb_precset| subroutine; once the type of preconditioning
%% method is specified, along with all the parameters that characterize
%% it, the preconditioner data structure can be built using the
%% \verb|psb_precbld| subroutine.
%% This data structure wants to be flexible enough to easily allow the
%% implementation of new kind of preconditioners.
The values contained in
the \verb|iprcparm| and \verb|dprcparm| define tha type of
preconditioner along with all the parameters related to it; thus,
\verb|iprcparm| and \verb|dprcparm| define how the other records have
to be interpreted.
to be interpreted. This data structure is the basis of ore complex
preconditioning strategies, which are the subject of further
research.
\begin{figure}[h!]
\small
\begin{Sbox}