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149 lines
5.2 KiB
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<TITLE>Prerequisites</TITLE>
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<B> Next:</B> <A NAME="tex2html138"
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HREF="node7.html">Optional third party libraries</A>
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HREF="node5.html">Configuring and Building MLD2P4</A>
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HREF="node5.html">Configuring and Building MLD2P4</A>
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<H2><A NAME="SECTION00051000000000000000">
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Prerequisites</A>
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</H2>
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<P>
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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>[<A
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HREF="node25.html#blas3">10</A>,<A
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HREF="node25.html#blas2">11</A>,<A
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HREF="node25.html#blas1">17</A>] Many vendors provide optimized versions
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of the Basic Linear Algebra Subprograms; if no vendor version is
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available for a given platform, the ATLAS software
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(<code>http://math-atlas.sourceforge.net/</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 are 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 computations 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
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HREF="node25.html#MPI2">16</A>,<A
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HREF="node25.html#MPI1">21</A>] A version of MPI is available on most
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high-performance computing systems; only version 1.1 is required.
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</DD>
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<DT><STRONG>BLACS</STRONG></DT>
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<DD>[<A
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HREF="node25.html#BLACS">12</A>] The Basic Linear Algebra Communication Subprograms
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are 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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<DT><STRONG>PSBLAS</STRONG></DT>
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<DD>[<A
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HREF="node25.html#PSBLASGUIDE">14</A>,<A
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HREF="node25.html#psblas_00">15</A>] Parallel Sparse BLAS is
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available from
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<BR><code>http://www.ce.uniroma2.it/psblas</code>; version 2.3.1
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(or later) is required. Indeed, all the prerequisites
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listed so far are also prerequisites of PSBLAS.
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To build the MLD2P4 library it is necessary to get access to
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the source PSBLAS directory employed to build the version under use; after
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the MLD2P4 build process completes, only the compiled form of the
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PSBLAS library is necessary to build user applications.
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</DD>
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</DL>
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<P>
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Please note that the four previous libraries must have Fortran
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interfaces compatible with MLD2P4;
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usually this means that they should all be built with the same
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compiler as MLD2P4.
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