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This directory contains the PSBLAS library, version 3.3.
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Existing codes will work untouched with version 3.3, but they will
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have to be recompiled; new methods have been added for the sake of GPU
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computations, plus the usual bunch of bug fixes.
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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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The new internals have been completely overhauled, and in many cases
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rewritten; they now enable a much better interfacing with user-defined
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storage formats. If the user is only interested in the predefined
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formats, then the user's guide should be sufficient; what is somewhat
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lacking is documentation on how to add to the library, i.e. a
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developers' guide; stay tuned.
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The architecture of the Fortran 2003 sparse BLAS is described in
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S. Filippone, A. Buttari:
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Object-Oriented Techniques for Sparse Matrix Computations in Fortran
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2003,
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ACM Trans. on Math. Software, vol. 38, No. 4, 2012.
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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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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-3.2.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
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test/pargen/ppde[23]d.f90
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OTHER SOFTWARE CREDITS
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We originally included a modified implementation of some of the
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Sparker (serial sparse BLAS) material; this has been completely
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rewritten, way beyond the intention(s) and responsibilities of the
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original developers.
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The main reference for the serial 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 specify --with-metis.
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4. If you have the AMD package of Davis, Duff and Amestoy, you can
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specify --with-amd (see ./configure --help for more details).
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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 gnu46 openmpi
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This will delegate to the modules setup to make sure that the version
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of openmpi in use is the one compiled with the gnu46 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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SERIAL
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Configuring with --enable-serial will provide a fake MPI stub library
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that enables running in pure serial mode; no MPI installation is
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needed in this case (but note that the fake MPI stubs are only
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guaranteed to cover what we use internally, it's not a complete
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replacement).
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EXPERIMENTAL
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We have an experimental flag --enable-long-integers that will enable having
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8-byte integer data, allowing an index space larger than 2G; some
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small cases have been tested but we do not offer full guarantee (yet).
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COMPILER NOTES.
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This code is confirmed to work with the following compilers (or
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later versions thereof):
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NAGware 5.2;
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GNU 4.7.3;
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Cray CCE 8.0.1;
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They are all recognized by the configure script.
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To make the script work with the Cray CCE environment, it is
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recommended to use the following:
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./configure FC=ftn F77=ftn CC=cc MPF90=ftn MPF77=ftn MPCC=cc
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with both CCE and GNU lower-level compilers.
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XLF 13.1 configures correctly, but then fails with ICEs (Internal
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Compiler Error) at build time. We do not yet know whether XLF 14
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compiles correctly.
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For the GNU compilers 4.6.x we are aware of a number of memory management
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issues that might surface in your applications; most of them (that
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we're aware of) are solved in version 4.7.2 or later.
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The Intel compiler up to version 12.1 fails to compile, as of the last
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version we got access to.
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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 3:
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Salvatore Filippone
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Alfredo Buttari
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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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