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MLD2P4
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MultiLevel Domain Decomposition Parallel Preconditioners Package
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based on PSBLAS (Parallel Sparse BLAS version 3.5)
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Salvatore Filippone Cranfield University, UK
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Pasqua D'Ambra IAC-CNR, Naples, IT
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Daniela di Serafino Univ. of Campania "L. Vanvitelli", Caserta, IT
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---------------------------------------------------------------------
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MLD2P4 (MultiLevel Domain Decomposition Parallel Preconditioners
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Package based on PSBLAS) provides parallel Algebraic MultiGrid (AMG)
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and Domain Decomposition preconditioners, to be used in the
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iterative solution of linear systems.
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The name of the package comes from its original implementation,
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containing multilevel additive and hybrid Schwarz preconditioners,
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as well as one-level additive Schwarz preconditioners. The current
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version extends the original plan by including multilevel cycles
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and smoothers widely used in multigrid methods. A purely algebraic
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approach is applied to generate coarse-level corrections, so that
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no geometric background is needed concerning the matrix to be
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preconditioned.
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MLD2P4 has been designed to provide scalable and easy-to-use
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preconditioners in the context of the PSBLAS (Parallel Sparse Basic
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Linear Algebra Subprograms) computational framework and is used
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in conjuction with the Krylov solvers available from PSBLAS. The
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package employs object-oriented design techniques in Fortran 2003,
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with interfaces to additional third party libraries such as MUMPS,
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UMFPACK, SuperLU, and SuperLU_Dist, which can be exploited in building
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multilevel preconditioners. The parallel implementation is based on
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a Single Program Multiple Data (SPMD) paradigm; the inter-process
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communication is based on MPI and is managed mainly through PSBLAS.
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MAIN REFERENCE:
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P. D'Ambra, D. di Serafino, S. Filippone,
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MLD2P4: a Package of Parallel Algebraic Multilevel Domain Decomposition
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Preconditioners in Fortran 95,
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ACM Transactions on Mathematical Software, 37 (3), 2010, art. 30,
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doi: 10.1145/1824801.1824808.
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TO COMPILE
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0. Unpack the tar file in a directory of your choice (preferrably
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outside the main PSBLAS directory).
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1. run configure --with-psblas=<ABSOLUTE path of the PSBLAS install directory>
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adding the options for MUMPS, SuperLU, SuperLU_Dist, UMFPACK as desired.
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See MLD2P4 User's and Reference Guide (Section 3) for details.
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2. Tweak Make.inc if you are not satisfied.
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3. make;
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4. Go into the test subdirectory and build the examples of your choice.
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5. (if desired): make install
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NOTES
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- The single precision version is supported only by MUMPS and SuperLU;
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thus, even if you specify at configure time to use UMFPACK or SuperLU_Dist,
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the corresponding preconditioner options will be available only from
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the double precision version.
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- The preconditioners in MLD2P4 extend those of PSBLAS and are meant
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to be used with the PSBLAS Krylov solvers; so in an existing program
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you need to modify the type of the preconditioner object and its
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settings, but the rest of the application needs not be changed.
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CREDITS
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Contributors to version 2:
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Salvatore Filippone
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Pasqua D'Ambra
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Daniela di Serafino
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Ambra Abdullahi Hassan
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Contributors to version 1:
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Salvatore Filippone
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Pasqua D'Ambra
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Daniela di Serafino
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Alfredo Buttari
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