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<H2><A NAME="SECTION00051000000000000000"></A><A NAME="sec:prerequisites"></A>
<BR>
Prerequisites
</H2><BIG CLASS="LARGE"><BIG CLASS="LARGE"></BIG></BIG>
<P>
<BIG CLASS="LARGE"><BIG CLASS="LARGE"><BIG CLASS="LARGE">The following base libraries are needed:
</BIG></BIG></BIG><DL>
<DT><STRONG>BLAS</STRONG></DT>
<DD>[<A
HREF="node36.html#blas3">11</A>,<A
HREF="node36.html#blas2">12</A>,<A
HREF="node36.html#blas1">18</A>] Many vendors provide optimized versions
of BLAS; if no vendor version is
available for a given platform, the ATLAS software
(<TT><A NAME="tex2html1"
HREF="math-atlas.sourceforge.net">math-atlas.sourceforge.net</A></TT>)
may be employed. The reference BLAS from Netlib
(<TT><A NAME="tex2html2"
HREF="www.netlib.org/blas">www.netlib.org/blas</A></TT>) 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 MUMPS, UMFPACK or SuperLU third party
libraries. Note that UMFPACK requires a full LAPACK library; our
experience is that configuring ATLAS for building full LAPACK does not
work in the correct way. Our advice is first to download the LAPACK tarfile from
<TT><A NAME="tex2html3"
HREF="www.netlib.org/lapack">www.netlib.org/lapack</A></TT> and install it independently of ATLAS. In this case,
you need to modify the OPTS and NOOPT definitions for including -fPIC compilation option
in the make.inc file of the LAPACK library.
</DD>
<DT><STRONG>MPI</STRONG></DT>
<DD>[<A
HREF="node36.html#MPI2">17</A>,<A
HREF="node36.html#MPI1">23</A>] A version of MPI is available on most
high-performance computing systems.
</DD>
<DT><STRONG>PSBLAS</STRONG></DT>
<DD>[<A
HREF="node36.html#PSBLASGUIDE">13</A>,<A
HREF="node36.html#psblas_00">15</A>] Parallel Sparse BLAS (PSBLAS) is
available from <TT><A NAME="tex2html4"
HREF="github.com/sfilippone/psblas3">github.com/sfilippone/psblas3</A></TT>; version
3.5.0 (or later) is required. Indeed, all the prerequisites
listed so far are also prerequisites of PSBLAS.
</DD>
</DL><BIG CLASS="LARGE"><BIG CLASS="LARGE"><BIG CLASS="LARGE">
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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