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<H2><A NAME="SECTION00051000000000000000">
Prerequisites</A>
</H2>

<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>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
  3.0   (or later) is required. Indeed, all the prerequisites
  listed so far are also prerequisites of PSBLAS.
</DD>
</DL>
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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