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71
README
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MLD2P4 version 2.1
MLD2P4
MultiLevel Domain Decomposition Parallel Preconditioners Package
based on PSBLAS (Parallel Sparse BLAS version 3.5)
@ -44,60 +44,6 @@ ACM Transactions on Mathematical Software, 37 (3), 2010, art. 30,
doi: 10.1145/1824801.1824808.
WHAT'S NEW
Version 2.1
1. The multigrid preconditioner now include fully general V- and
W-cycles. We also support K-cycles, both for symmetric and
nonsymmetric matrices, intended to be used in conjunction
with Flexible CG or GCR available in PSBLAS 3.5.
2. The smoothers now include popular variants such as Jacobi,
forward and backward hybrid Gauss-Seidel (intra-process
Gauss-Seidel, inter-process block-Jacobi).
3. The PRE and POST specification for smoothers can now be
specified independently of each other: you can even specify
different smoothers for PRE and POST (e.g. forward Gauss-Seidel
PRE with backward Gauss-Seidel POST). The default is to
have the specs apply to both PRE and POST.
Version 2.0.
Finally moved to F2003, with the support of PSBLAS3.
There are a few minor differences at user level:
1. In the configure step, you should specify the INSTALL directory
of PSBLAS version 3.4, not the source directory;
2. In the various makefiles, libmld_prec.a should now be used in
addition (and in front of) libpsb_prec.a, and no longer in
place of it.
3. As for the basic usage, this is practically identical to the
previous version(s).
You should use the same MPI/serial compilers that were used for the
PSBLAS installation.
The Fortran 2003 support means that it is far easier to develop and
integrate new solvers and smoothers; you need to take one of the
existing solvers/smoothers as a model, develop your own by
changing/replacing the model contents, and then pass the new object
to the PREC%SET() method which will copy into the internals, as per
the PROTOTYPE design pattern. Take a look at the test/newslv
directory to see an example. It's easier done than said!
Versions known to work:
UMFPACK: 5.4
SuperLU: 4.3 and 5.0
SuperLU_Dist: 3.3 and 4.2
Note that with SuperLU_Dist you will probably need to add further
link options, e.g. the ParMetis library or the openmp runtime;
you can do this using the configure option --with-extra-libs
In version 1.1:
- The MLD_SIZEOF() function has been redefined to be INTEGER(8), so
as to be able to measure large data sets.
- The internals of the multilevel preconditioner have been repackaged
in a more structured fashion; no changes are needed in the user
code.
- Note that we now need version 2.3.1 of PSBLAS.
TO COMPILE
@ -126,18 +72,3 @@ NOTES
application continues to make use of the PSBLAS existing
interfaces.
CREDITS
Contributors to version 2:
Salvatore Filippone
Pasqua D'Ambra
Daniela di Serafino
Ambra Abdullahi Hassan
Contributors to version 1:
Salvatore Filippone
Pasqua D'Ambra
Daniela di Serafino
Alfredo Buttari

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ReleaseNews
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WHAT'S NEW
Version 2.1
1. The multigrid preconditioner now include fully general V- and
W-cycles. We also support K-cycles, both for symmetric and
nonsymmetric matrices, intended to be used in conjunction
with Flexible CG or GCR available in PSBLAS 3.5.
2. The smoothers now include popular variants such as Jacobi,
forward and backward hybrid Gauss-Seidel (intra-process
Gauss-Seidel, inter-process block-Jacobi).
3. The PRE and POST specification for smoothers can now be
specified independently of each other: you can even specify
different smoothers for PRE and POST (e.g. forward Gauss-Seidel
PRE with backward Gauss-Seidel POST). The default is to
have the specs apply to both PRE and POST.
Version 2.0.
Finally moved to F2003, with the support of PSBLAS3.
There are a few minor differences at user level:
1. In the configure step, you should specify the INSTALL directory
of PSBLAS version 3.4, not the source directory;
2. In the various makefiles, libmld_prec.a should now be used in
addition (and in front of) libpsb_prec.a, and no longer in
place of it.
3. As for the basic usage, this is practically identical to the
previous version(s).
You should use the same MPI/serial compilers that were used for the
PSBLAS installation.
The Fortran 2003 support means that it is far easier to develop and
integrate new solvers and smoothers; you need to take one of the
existing solvers/smoothers as a model, develop your own by
changing/replacing the model contents, and then pass the new object
to the PREC%SET() method which will copy into the internals, as per
the PROTOTYPE design pattern. Take a look at the test/newslv
directory to see an example. It's easier done than said!
Versions known to work:
UMFPACK: 5.4
SuperLU: 4.3 and 5.0
SuperLU_Dist: 3.3 and 4.2
Note that with SuperLU_Dist you will probably need to add further
link options, e.g. the ParMetis library or the openmp runtime;
you can do this using the configure option --with-extra-libs
In version 1.1:
- The MLD_SIZEOF() function has been redefined to be INTEGER(8), so
as to be able to measure large data sets.
- The internals of the multilevel preconditioner have been repackaged
in a more structured fashion; no changes are needed in the user
code.
- Note that we now need version 2.3.1 of PSBLAS.
CREDITS
Contributors to version 2:
Salvatore Filippone
Pasqua D'Ambra
Daniela di Serafino
Ambra Abdullahi Hassan
Contributors to version 1:
Salvatore Filippone
Pasqua D'Ambra
Daniela di Serafino
Alfredo Buttari
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