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Docs updates for DIAG/Gauss-Seidel
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Salvatore Filippone
2016-02-29 16:14:42 +00:00
parent 667e84ebed
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@@ -169,14 +169,25 @@ can be logically divided into four groups, i.e. parameters defining
A list of the parameters that can be set, along with their allowed and
default values, is given in Tables&nbsp;<A HREF="#tab:p_type">2</A>-<A HREF="#tab:p_coarse">5</A>.
For a detailed description of the meaning of the parameters, please
refer to Section&nbsp;<A HREF="node11.html#sec:background">4</A>. The smoother and solver objects are arranged in a hierarchical manner;
refer to Section&nbsp;<A HREF="node11.html#sec:background">4</A>.
<P>
The smoother and solver objects are arranged in a hierarchical manner;
when specifying a smoother object, its parameters including the
contained solver are set to default values, and when a solver
object is specified its defaults are also set, overriding in both
cases any previous settings even if explicitly specified. Therefore if
the user sets a new smoother, and wishes to use a solver
different from the default one, the call to set the solver must come
<I>after</I> the call to set the smoother. Completely new smoother and/or solver class derived from the
<I>after</I> the call to set the smoother.
<P>
The combination of a Jacobi smoother with a Diagonal Scaling local
solver is equivalent to the strategy called Point Jacobi in the
literature; similarly, having a Jacobi smoother with a Gauss-Seidel
local solver is equivalent to a ``hybrid Gauss-Seidel'' solver.
<P>
Completely new smoother and/or solver class derived from the
base objects in the library may be used without recompiling the
library itself. Once the new smoother/solver class has been
developed, the user can declare a variable of that new type in the