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Salvatore Filippone
6002976472
New checks in build of multilevel preconditioners: separated aggregation from smoother build, and reconfigure number of levels "on the fly" when appropriate.
59 lines
2.1 KiB
Plaintext
59 lines
2.1 KiB
Plaintext
This directory contains the MLD2P4 set of preconditioners, version 1.0.1
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WHAT'S NEW
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In version 1.0.1:
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- The MLD_SIZEOF() function has been redefined to be INTEGER(8), so
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as to be able to measure large data sets.
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- The internals of the multilevel preconditioner have been repackaged
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in a more structured fashion; no changes are needed in the user
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code.
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- Note that we now need version 2.3.1 of PSBLAS.
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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 source directory>
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adding the options for SuperLU, SuperLU_Dist, UMFPACK as desired.
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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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Notes:
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- The single precision version is supported only by SuperLU; thus, even
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if you specify at configure to use UMFPACK or SuperLU_Dist, the
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corresponding preconditioner options will be available only from the
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double precision version.
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- The Krylov methods are linked and recompiled from the PSBLAS source
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directory; thus we define here two libraries, libmld_krylov.a and
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libmld_prec.a, and a bunch of modules, including a duplicate of
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psb_krylov_mod.mod. The directories for the MLD2P4 versions, in both
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the include and link paths, must come before the PSBLAS ones,
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because the Krylov interface is superseded by the new one.
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Once the CLASS() construct becomes available in Gnu Fortran, this
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will no longer be necessary, and the duplicate Krylov library and
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module will go away, leaving only the mld_prec library and module.
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- A program that was using the PSBLAS precoditioners needs no source
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code changes, but should be recompiled. If the new preconditioner
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(or preconditioner options, such as ILU(N) factorization) are
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required, only the type of the preconditioner object and its
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setup/build/free calls should be updated; the rest of the
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application continues to make use of the PSBLAS existing
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interfaces.
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CREDITS
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developed by
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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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