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<A NAME="tex2html168"
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<B> Next:</B> <A NAME="tex2html169"
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HREF="node8.html">Optional third party libraries</A>
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<B> Up:</B> <A NAME="tex2html165"
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HREF="node6.html">Configuring and Building MLD2P4</A>
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<B> Previous:</B> <A NAME="tex2html159"
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HREF="node6.html">Configuring and Building MLD2P4</A>
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<B> <A NAME="tex2html167"
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HREF="node2.html">Contents</A></B>
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<BR>
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<!--End of Navigation Panel-->
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<H2><A NAME="SECTION00051000000000000000"></A><A NAME="sec:prerequisites"></A>
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<BR>
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Prerequisites
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</H2><FONT SIZE="+1"><FONT SIZE="+1"></FONT></FONT>
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<P>
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<FONT SIZE="+1"><FONT SIZE="+1"><FONT SIZE="+1">The following base libraries are needed:
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</FONT></FONT></FONT><DL>
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<DT><STRONG>BLAS</STRONG></DT>
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<DD>[<A
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HREF="node30.html#blas3">11</A>,<A
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HREF="node30.html#blas2">12</A>,<A
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HREF="node30.html#blas1">17</A>] Many vendors provide optimized versions
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of BLAS; if no vendor version is
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available for a given platform, the ATLAS software
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(<TT><A NAME="tex2html1"
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HREF="math-atlas.sourceforge.net">math-atlas.sourceforge.net</A></TT>)
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may be employed. The reference BLAS from Netlib
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(<TT><A NAME="tex2html2"
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HREF="www.netlib.org/blas">www.netlib.org/blas</A></TT>) 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 MUMPS, UMFPACK or SuperLU third party
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libraries. Note that UMFPACK requires a full LAPACK library; our
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experience is that configuring ATLAS for building full LAPACK does not
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work in the correct way. Our advice is first to download the LAPACK tarfile from
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<TT><A NAME="tex2html3"
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HREF="www.netlib.org/lapack">www.netlib.org/lapack</A></TT> and install it independently of ATLAS. In this case,
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you need to modify the OPTS and NOOPT definitions for including -fPIC compilation option
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in the make.inc file of the LAPACK library.
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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="node30.html#MPI2">16</A>,<A
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HREF="node30.html#MPI1">22</A>] A version of MPI is available on most
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high-performance computing systems.
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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="node30.html#PSBLASGUIDE">13</A>,<A
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HREF="node30.html#psblas_00">15</A>] Parallel Sparse BLAS (PSBLAS) is
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available from <TT><A NAME="tex2html4"
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HREF="github.com/sfilippone/psblas3">github.com/sfilippone/psblas3</A></TT>; version
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3.5.0 (or later) is required. Indeed, all the prerequisites
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listed so far are also prerequisites of PSBLAS.
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</DD>
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</DL><FONT SIZE="+1"><FONT SIZE="+1"><FONT SIZE="+1">
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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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</FONT></FONT></FONT>
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<P>
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<BR>
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<B> Next:</B> <A NAME="tex2html169"
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HREF="node8.html">Optional third party libraries</A>
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<B> Up:</B> <A NAME="tex2html165"
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HREF="node6.html">Configuring and Building MLD2P4</A>
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<B> Previous:</B> <A NAME="tex2html159"
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HREF="node6.html">Configuring and Building MLD2P4</A>
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HREF="node2.html">Contents</A></B>
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