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Fixes from Pasqua
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@@ -219,7 +219,7 @@ Furthermore, specifying block-Jacobi as coarsest-level
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solver implies that the coarsest-level matrix is distributed
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among the processes.
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Figure~\ref{fig:ex3} shows how to set a W-cycle preconditioner which
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applies no pre-smoother and 2 Gauss-Seidel sweeps as post-smoother,
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applies 2 Gauss-Seidel sweeps as pre- and post-smoother,
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and solves the coarsest-level system with the multifrontal LU factorization
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implemented in MUMPS. It is specified that the coarsest-level
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matrix is distributed, since MUMPS can be used on both
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@@ -227,14 +227,14 @@ replicated and distributed matrices, and by default
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it is used on replicated ones. Note the use of the parameter \verb|pos|
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to specify a property only for the pre-smoother or the post-smoother
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(see Section~\ref{sec:precset} for more details).
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Note also that a Krylov method different from CG must be used to solve
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the preconditioned system, since the preconditione in nonsymmetric.
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The code fragments shown in Figures~\ref{fig:ex2} and \ref{fig:ex3} are
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included in the example program file \verb|mld_dexample_ml.f90| too.
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Finally, Figure~\ref{fig:ex4} shows the setup of a one-level
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additive Schwarz preconditioner, i.e., RAS with overlap 2. The
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corresponding example program is available in the file
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additive Schwarz preconditioner, i.e., RAS with overlap 2.
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Note also that a Krylov method different from CG must be used to solve
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the preconditioned system, since the preconditione in nonsymmetric.
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The corresponding example program is available in the file
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\verb|mld_dexample_1lev.f90|.
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For all the previous preconditioners, example programs where the sparse matrix and
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@@ -282,20 +282,18 @@ boundary conditions are also available in the directory \verb|examples/pdegen|.
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\begin{verbatim}
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... ...
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! build a W-cycle preconditioner with 2 Gauss-Seidel sweeps as
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! post-smoother (and no pre-smoother), a distributed coarsest
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! pre- and post-smoother, a distributed coarsest
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! matrix, and MUMPS as coarsest-level solver
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call P%init('ML',info)
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call P%set('ML_TYPE','WCYCLE',info)
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call P%set('SMOOTHER_TYPE','GS',info)
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call P%set('SMOOTHER_SWEEPS',0,info,pos='PRE')
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call P%set('SMOOTHER_SWEEPS',2,info,pos='PRE')
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call P%set('SMOOTHER_SWEEPS',2,info,pos='POST')
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call P%set('COARSE_SOLVE','MUMPS',info)
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call P%set('COARSE_MAT','DIST',info)
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call P%hierarchy_build(A,desc_A,info)
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call P%smoothers_build(A,desc_A,info)
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... ...
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! solve Ax=b with preconditioned BiCGSTAB
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call psb_krylov('BICGSTAB',A,P,b,x,tol,desc_A,info)
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\end{verbatim}
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}
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\end{minipage}
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@@ -314,6 +312,8 @@ boundary conditions are also available in the directory \verb|examples/pdegen|.
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call P%set('SUB_OVR',2,info)
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call P%bld(A,desc_A,info)
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... ...
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! solve Ax=b with preconditioned BiCGSTAB
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call psb_krylov('BICGSTAB',A,P,b,x,tol,desc_A,info)
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\end{verbatim}
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}
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\end{minipage}
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@@ -53,7 +53,7 @@
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! sweeps (with ILU(0) on the blocks) as coarsest-level solver(Sec. 5.1, Fig. 3)
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!
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! - choice = 3, build a W-cycle preconditioner with 2 Gauss-Seidel sweeps as
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! post-smoother (and no pre-smoother), a distributed coarsest
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! pre- and post-smoother, a distributed coarsest
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! matrix, and MUMPS as coarsest-level solver (Sec. 5.1, Fig. 4)
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!
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! The matrix and the rhs are read from files (if an rhs is not available, the
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@@ -238,11 +238,11 @@ program mld_dexample_ml
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call P%init('ML',info)
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call P%set('ML_TYPE','WCYCLE',info)
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call P%set('SMOOTHER_TYPE','GS',info)
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call P%set('SMOOTHER_SWEEPS',0,info,pos='PRE')
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call P%set('SMOOTHER_SWEEPS',2,info,pos='PRE')
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call P%set('SMOOTHER_SWEEPS',2,info,pos='POST')
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call P%set('COARSE_SOLVE','MUMPS',info)
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call P%set('COARSE_MAT','DIST',info)
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kmethod = 'BICGSTAB'
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kmethod = 'CG'
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end select
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! build the preconditioner
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@@ -267,7 +267,7 @@ program mld_dexample_ml
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call x%zero()
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call psb_geasb(x,desc_A,info)
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! solve Ax=b with preconditioned BiCGSTAB
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! solve Ax=b with preconditioned CG
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call psb_barrier(ictxt)
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t1 = psb_wtime()
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