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170 lines
5.9 KiB
Plaintext
170 lines
5.9 KiB
Plaintext
This directory contains the PSBLAS library, version 3.0-pre-release.
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WARNING: This is higly experimental, unstable, and almost undocumented.
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Do not count on anything to remain unchanged by the time 3.0
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really comes out.
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This version requires a working Fortran 2003 compiler; we do not use
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all of the language features (specifically, so far we did not employ
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FINAL subroutines), but the features we use were sufficient in
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identifying bugs in ALL compilers we tried (all the bugs have been
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reported and mostly fixed by the respective vendors).
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Notes: This code is confirmed to work with NAGware 5.2 on an i686 and
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XLF 13.1 on a POWER6.
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It does NOT work with GNU Fortran 4.5; it is one of the
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testbeds for GNU Fortran 4.6.
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GNU 4.6.0: as of Sep. 2, 2010 it works; note however that the
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configure script will define the HAVE_MOLD compilation flag,
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and this does not work properly until the fix for PR45451 is
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available. Until then, you'll need to take out HAVE_MOLD by
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hand in Make.inc.
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If you find it working with other compilers, please let us
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know.
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The "undocumented" in the warning above refers to the
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internals; the new internals have been completely overhauled,
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and in many cases rewritten; they are supposed to enable much
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better interfacing with user-defined storage formats. If the
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user is only interested in the predefined formats, then the
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user's guide should be sufficient; what is lacking is
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documentation on how to add to the library. This will come.
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Version 1.0 of the library was described in:
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S. Filippone, M. Colajanni
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PSBLAS: A library for parallel linear algebra computation on sparse matrices
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ACM Trans. on Math. Software, 26(4), Dec. 2000, pp. 527-550.
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PLATFORMS:
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OBSOLETE!!!!!!!! see above ...
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--The compilation process relies on the choice of an appropriate
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--Make.inc file; we have tested with AIX XLF, Intel ifort/Linux, Nag
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--f95/Linux, GNU Fortran/Linux, Sun Forte 6.2. If you succeed in
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--compiling with other compiler/operating systems please let us know.
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LINUX:
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UTILITIES
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The test/util directory contains some utilities to convert to/from
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Harwell-Boeing and MatrixMarket file formats.
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DOCUMENTATION
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See docs/psblas-2.3.pdf; an HTML version of the same document is
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available in docs/html.
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Please consult the sample programs, especially test/pargen/ppde.f90.
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OTHER SOFTWARE CREDITS
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We include our modified implementation of some of the Sparker (serial
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sparse BLAS) material, e.g. Jagged diagonal, plus a number of
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extensions of our own design. The original file spblas.f can be
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downloaded from matisa.cc.rl.ac.uk; of course any bugs in our
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implementation are our own to fix. The main reference for the serial
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sparse BLAS is:
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Duff, I., Marrone, M., Radicati, G., and Vittoli, C.
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Level 3 basic linear algebra subprograms for sparse matrices: a user
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level interface
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ACM Trans. Math. Softw., 23(3), 379-401, 1997.
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INSTALLING
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To compile and run our software you will need the following
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prerequisites (see also SERIAL below):
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1. A working version of MPI
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2. A version of the BLAS; if you don't have a specific version for
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your platform you may try ATLAS available from
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http://math-atlas.sourceforge.net/
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3. We have had good results with the METIS library, from
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http://www-users.cs.umn.edu/~karypis/metis/metis/main.html
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This is optional; it is used in the util and test/fileread
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directories but only if you define the HAVE_METIS directive.
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The configure script will generate a Make.inc file suitable for
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building the library.
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The script is capable of recognizing the needed libraries with their
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default names; if they are in unusual places consider adding the paths
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with --with-libs, or explicitly specifying the names in --with-blas, etc.
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Please note that a common way for the configure script to fail is to
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specify inconsistent MPI vs. plain compilers, either directly or
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indirectly via environment variables; e.g. specifying the Intel
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compiler with FC=ifort while at the same time having an MPIFC=mpif90
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which points to GNU Fortran.
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The best way to avoid this situation is (in our opinion) to use the
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environment modules package (see http://modules.sourceforge.net/), and
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load the relevant variables with (e.g.)
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module load gnu42 mpich
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This will delegate to the modules setup to make sure that the version
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of mpich in use is the one compiled with the gnu42 compilers.
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After the configure script has completed you can always tweak the
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Make.inc file yourself.
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After you have Make.inc fixed, run
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make
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to compile the library; go to the test directory and its
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subdirectories to get test programs done.
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If you specify --prefix=/path you can do make install and the
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libraries will be installed under /path/lib, while the module files
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will be installed under /path/include.
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KNOWN ISSUES.
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An annoying problem exists with some versions of MPI: if the configure
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script sets -DMPI_MOD the MPI call interfaces will be resolved by
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using the MPI Fortran module.
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However usage of the module may cause compilation to fail when
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coupled with the debugging option -g, because the compiler complains
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that it cannot find a matching interface for some of the
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communication routines.
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The solution: either take out the -g option, or, if you really need to
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debug, edit Make.inc to force -DMPI_H in place of -DMPI_MOD.
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TODO:
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Fix all reamining bugs. Bugs? We dont' have any ! ;-)
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The PSBLAS team.
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RELATED SOFTWARE
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If you are looking for more sophisticated preconditioners, you may be
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interested in the package MLD2P4 from http://www.mld2p4.it
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Contact: Salvatore Filippone salvatore.filippone@uniroma2.it
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Credits for version 2.2:
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Michele Martone contributed the initial version of the configure
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machinery.
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Credits for version 2.0:
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Salvatore Filippone
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Alfredo Buttari
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Credits for version 1.0:
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Salvatore Filippone
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Michele Colajanni
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Fabio Cerioni
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Stefano Maiolatesi
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Dario Pascucci
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