<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <!--Converted with LaTeX2HTML 2017.2 (Released Jan 23, 2017) --> <HTML> <HEAD> <TITLE>Prerequisites</TITLE> <META NAME="description" CONTENT="Prerequisites"> <META NAME="keywords" CONTENT="userhtml"> <META NAME="resource-type" CONTENT="document"> <META NAME="distribution" CONTENT="global"> <META NAME="Generator" CONTENT="LaTeX2HTML v2017.2"> <META HTTP-EQUIV="Content-Style-Type" CONTENT="text/css"> <LINK REL="STYLESHEET" HREF="userhtml.css"> <LINK REL="next" HREF="node8.html"> <LINK REL="previous" HREF="node6.html"> <LINK REL="up" HREF="node6.html"> <LINK REL="next" HREF="node8.html"> </HEAD> <BODY > <DIV CLASS="navigation"><!--Navigation Panel--> <A NAME="tex2html176" HREF="node8.html"> <IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="next.png"></A> <A NAME="tex2html172" HREF="node6.html"> <IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="up.png"></A> <A NAME="tex2html166" HREF="node6.html"> <IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="prev.png"></A> <A NAME="tex2html174" HREF="node2.html"> <IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" SRC="contents.png"></A> <BR> <B> Next:</B> <A NAME="tex2html177" HREF="node8.html">Optional third party libraries</A> <B> Up:</B> <A NAME="tex2html173" HREF="node6.html">Configuring and Building MLD2P4</A> <B> Previous:</B> <A NAME="tex2html167" HREF="node6.html">Configuring and Building MLD2P4</A> <B> <A NAME="tex2html175" HREF="node2.html">Contents</A></B> <BR> <BR></DIV> <!--End of Navigation Panel--> <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">17</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">16</A>,<A HREF="node36.html#MPI1">22</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. </BIG></BIG></BIG> <P> <BIG CLASS="LARGE"><BIG CLASS="LARGE"></BIG></BIG> <DIV CLASS="navigation"><HR> <!--Navigation Panel--> <A NAME="tex2html176" HREF="node8.html"> <IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="next.png"></A> <A NAME="tex2html172" HREF="node6.html"> <IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="up.png"></A> <A NAME="tex2html166" HREF="node6.html"> <IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="prev.png"></A> <A NAME="tex2html174" HREF="node2.html"> <IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" SRC="contents.png"></A> <BR> <B> Next:</B> <A NAME="tex2html177" HREF="node8.html">Optional third party libraries</A> <B> Up:</B> <A NAME="tex2html173" HREF="node6.html">Configuring and Building MLD2P4</A> <B> Previous:</B> <A NAME="tex2html167" HREF="node6.html">Configuring and Building MLD2P4</A> <B> <A NAME="tex2html175" HREF="node2.html">Contents</A></B> </DIV> <!--End of Navigation Panel--> </BODY> </HTML>