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147 lines
6.1 KiB
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147 lines
6.1 KiB
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<head><title>Prerequisites</title>
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<!--l. 28--><div class="crosslinks"><p class="noindent"><span
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class="cmr-12">[</span><a
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href="userhtmlsu2.html" ><span
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class="cmr-12">next</span></a><span
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class="cmr-12">] [</span><a
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<h4 class="subsectionHead"><span class="titlemark"><span
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class="cmr-12">3.1 </span></span> <a
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id="x8-70003.1"></a><span
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class="cmr-12">Prerequisites</span></h4>
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<!--l. 30--><p class="noindent" ><span
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class="cmr-12">The following base libraries are needed:</span>
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<dl class="description"><dt class="description">
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<span
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class="cmbx-12">BLAS</span> </dt><dd
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class="description"><span class="cite"><span
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class="cmr-12">[</span><a
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href="userhtmlli4.html#Xblas3"><span
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class="cmr-12">13</span></a><span
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class="cmr-12">,</span><span
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class="cmr-12"> </span><a
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href="userhtmlli4.html#Xblas2"><span
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class="cmr-12">14</span></a><span
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class="cmr-12">,</span><span
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class="cmr-12"> </span><a
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href="userhtmlli4.html#Xblas1"><span
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class="cmr-12">20</span></a><span
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class="cmr-12">]</span></span> <span
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class="cmr-12">Many vendors provide optimized versions of BLAS; if no</span>
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<span
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class="cmr-12">vendor version is available for a given platform, the ATLAS software</span>
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<span
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class="cmr-12">(</span><a
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href="math-atlas.sourceforge.net" class="url" ><span
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class="cmtt-12">math-atlas.sourceforge.net</span></a><span
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class="cmr-12">) may be employed. The reference BLAS</span>
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<span
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class="cmr-12">from Netlib (</span><a
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href="www.netlib.org/blas" class="url" ><span
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class="cmtt-12">www.netlib.org/blas</span></a><span
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class="cmr-12">) are meant to define the standard</span>
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<span
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class="cmr-12">behaviour of the BLAS interface, so they are not optimized for any particular</span>
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<span
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class="cmr-12">platform, and should only be used as a last resort. Note that BLAS</span>
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<span
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class="cmr-12">computations form a relatively small part of the AMG4PSBLAS/PSBLAS</span>
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<span
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class="cmr-12">computations; they are however critical when using preconditioners based</span>
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<span
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class="cmr-12">on MUMPS, UMFPACK or SuperLU third party libraries. Note that</span>
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<span
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class="cmr-12">UMFPACK requires a full LAPACK library; our experience is that</span>
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<span
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class="cmr-12">configuring ATLAS for building full LAPACK does not work in the</span>
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<span
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class="cmr-12">correct way. Our advice is first to download the LAPACK tarfile from</span>
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<a
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href="www.netlib.org/lapack" class="url" ><span
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class="cmtt-12">www.netlib.org/lapack</span></a> <span
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class="cmr-12">and install it independently of ATLAS. In this</span>
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<span
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class="cmr-12">case, you need to modify the OPTS and NOOPT definitions for including</span>
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<span
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class="cmr-12">-fPIC compilation option in the make.inc file of the LAPACK library.</span>
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</dd><dt class="description">
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<span
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class="cmbx-12">MPI</span> </dt><dd
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class="description"><span class="cite"><span
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class="cmr-12">[</span><a
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href="userhtmlli4.html#XMPI2"><span
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class="cmr-12">19</span></a><span
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class="cmr-12">,</span><span
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class="cmr-12"> </span><a
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href="userhtmlli4.html#XMPI1"><span
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class="cmr-12">25</span></a><span
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class="cmr-12">]</span></span> <span
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class="cmr-12">A version of MPI is available on most high-performance computing</span>
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<span
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class="cmr-12">systems.</span>
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</dd><dt class="description">
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<span
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class="cmbx-12">PSBLAS</span> </dt><dd
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class="description"><span class="cite"><span
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class="cmr-12">[</span><a
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href="userhtmlli4.html#XPSBLASGUIDE"><span
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class="cmr-12">15</span></a><span
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class="cmr-12">,</span><span
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class="cmr-12"> </span><a
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href="userhtmlli4.html#Xpsblas_00"><span
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class="cmr-12">17</span></a><span
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class="cmr-12">]</span></span> <span
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class="cmr-12">Parallel Sparse BLAS (PSBLAS) is available from</span>
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<a
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href="github.com/sfilippone/psblas3" class="url" ><span
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class="cmtt-12">github.com/sfilippone/psblas3</span></a> <span
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class="cmr-12">?? </span><span
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class="cmbx-12">Mettere tutto sotto psctoolkit</span><span
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class="cmr-12">;</span>
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<span
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class="cmr-12">version 3.5.0 (or later) is required. Indeed, all the prerequisites listed so far</span>
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<span
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class="cmr-12">are also prerequisites of PSBLAS.</span></dd></dl>
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<!--l. 56--><p class="noindent" ><span
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class="cmr-12">Please note that the four previous libraries must have Fortran interfaces compatible with</span>
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<span
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class="cmr-12">AMG4PSBLAS; usually this means that they should all be built with the same</span>
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<span
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class="cmr-12">compiler as AMG4PSBLAS.</span>
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<!--l. 61--><div class="crosslinks"><p class="noindent"><span
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class="cmr-12">[</span><a
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href="userhtmlsu2.html" ><span
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class="cmr-12">next</span></a><span
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class="cmr-12">] [</span><a
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href="userhtmlsu1.html" ><span
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class="cmr-12">front</span></a><span
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class="cmr-12">] [</span><a
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href="userhtmlse3.html#userhtmlsu1.html" ><span
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class="cmr-12">up</span></a><span
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class="cmr-12">] </span></p></div>
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