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<H2><A NAME="SECTION00051000000000000000">
Prerequisites</A>
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<P>
The following base libraries are needed:
<DL>
<DT><STRONG>BLAS</STRONG></DT>
<DD>[<A
HREF="node25.html#blas3">11</A>,<A
HREF="node25.html#blas2">12</A>,<A
HREF="node25.html#blas1">18</A>] Many vendors provide optimized versions
of the Basic Linear Algebra Subprograms; if no vendor version is
available for a given platform, the ATLAS software
(<code>http://math-atlas.sourceforge.net/</code>)
may be employed. The reference BLAS from Netlib
(<code>http://www.netlib.org/blas</code>) are meant to define the standard
behaviour of the BLAS interface, so they are not optimized for any
particular plaftorm, and should only be used as a last
resort. Note that BLAS computations form a relatively small part of
the MLD2P4/PSBLAS computations; they are however critical when using
preconditioners based on the UMFPACK or SuperLU third party
libraries.
</DD>
<DT><STRONG>MPI</STRONG></DT>
<DD>[<A
HREF="node25.html#MPI2">17</A>,<A
HREF="node25.html#MPI1">22</A>] A version of MPI is available on most
high-performance computing systems; only version 1.1 is required.
</DD>
<DT><STRONG>BLACS</STRONG></DT>
<DD>[<A
HREF="node25.html#BLACS">13</A>] The Basic Linear Algebra Communication Subprograms
are available in source form from <code>http://www.netlib.org/blacs</code>;
some vendors include them in their parallel computing
support libraries.
</DD>
<DT><STRONG>PSBLAS</STRONG></DT>
<DD>[<A
HREF="node25.html#PSBLASGUIDE">15</A>,<A
HREF="node25.html#psblas_00">16</A>] Parallel Sparse BLAS is
available from
<BR><code>http://www.ce.uniroma2.it/psblas</code>; version 2.3.1
(or later) is required. Indeed, all the prerequisites
listed so far are also prerequisites of PSBLAS.
To build the MLD2P4 library it is necessary to get access to
the source PSBLAS directory employed to build the version under use; after
the MLD2P4 build process completes, only the compiled form of the
PSBLAS library is necessary to build user applications.
</DD>
</DL>
<P>
Please note that the four previous libraries must have Fortran
interfaces compatible with MLD2P4;
usually this means that they should all be built with the same
compiler as MLD2P4.
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