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<TITLE>Prerequisites</TITLE>
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<H2><A NAME="SECTION00051000000000000000">
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Prerequisites</A>
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</H2>
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The following base libraries are needed:
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<DL>
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<DT><STRONG>BLAS</STRONG></DT>
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<DD>The Basic Linear Algebra subprograms. Many vendors provide
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optimized versions; if no vendor version is available for a given
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platform, the ATLAS software <code>http://www.netlib.org/atlas</code>
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may be employed. The reference BLAS from Netlib
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<code>http://www.netlib.org/blas</code> are meant to define the standard
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behaviour of the BLAS interface, so they not optimized for any
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particular plaftorm, and should only be used as a last
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resort. Note that BLAS computation form a relatively small part of
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the MLD2P4/PSBLAS computations; they are however critical when using
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preconditioners based on the UMFPACK or SuperLU third party
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libraries.
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</DD>
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<DT><STRONG>MPI</STRONG></DT>
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<DD>A version of MPI is available on most high performance
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computing system; we only require version 1.1.
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</DD>
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<DT><STRONG>BLACS</STRONG></DT>
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<DD>The Basic Linear Algebra Communication Subroutines are
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available in source form from <code>http://www.netlib.org/blacs</code>;
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some vendors include them in their parallel computing
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support libraries.
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</DD>
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</DL>
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<P>
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The MLD2P4 software requires PSBLAS version 2.3 (at least), available
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from <code>http://www.ce.uniroma2.it/psblas</code>; indeed, all the
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prerequisites listed so far are also prerequisites of PSBLAS. Please
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note that to build the MLD2P4 library it is necessary to get access to
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the source PSBLAS directory used to build the version under use; after
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the build process completes, only the compiled form of the library is
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necessary to build user applications.
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<P>
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Please note that all the libraries listed so fare (BLAS, MPI, BLACS,
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PSBLAS) must have Fortran interfaces compatible with the MLD2P4;
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usually this means that they should all be built with the same
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compiler.
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<ADDRESS>
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Salvatore Filippone
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2008-07-22
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