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144 lines
5.9 KiB
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144 lines
5.9 KiB
HTML
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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">] [</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="http://math-atlas.sourceforge.net" ><span
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class="cmr-12">math-atlas.sourceforge.net</span></a><span
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class="cmr-12">) may be employed. The reference BLAS from</span>
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<span
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class="cmr-12">Netlib (</span><a
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href="http://www.netlib.org/blas" ><span
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class="cmr-12">www.netlib.org/blas</span></a><span
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class="cmr-12">) are meant to define the standard behaviour of</span>
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<span
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class="cmr-12">the BLAS interface, so they are not optimized for any particular platform,</span>
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<span
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class="cmr-12">and should only be used as a last resort. Note that BLAS computations</span>
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<span
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class="cmr-12">form a relatively small part of the AMG4PSBLAS/PSBLAS computations;</span>
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<span
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class="cmr-12">they are however critical when using preconditioners based on MUMPS,</span>
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<span
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class="cmr-12">UMFPACK or SuperLU third party libraries. Note that UMFPACK requires</span>
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<span
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class="cmr-12">a full LAPACK library; our experience is that configuring ATLAS for</span>
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<span
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class="cmr-12">building full LAPACK does not work in the correct way. Our advice is first</span>
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<span
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class="cmr-12">to download the LAPACK tarfile from </span><a
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href="http://www.netlib.org/lapack" ><span
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class="cmr-12">www.netlib.org/lapack</span></a> <span
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class="cmr-12">and install it</span>
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<span
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class="cmr-12">independently of ATLAS. In this case, you need to modify the OPTS and</span>
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<span
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class="cmr-12">NOOPT definitions for including -fPIC compilation option in the make.inc</span>
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<span
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class="cmr-12">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="https://psctoolkit.github.io/products/psblas/" ><span
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class="cmr-12">psctoolkit.github.io/products/psblas/</span></a><span
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class="cmr-12">; version 3.7.0 (or later) is required.</span>
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<span
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class="cmr-12">Indeed, all the prerequisites listed so far 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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class="cmr-12">] [</span><a
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class="cmr-12">] [</span><a
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class="cmr-12">] </span></p></div>
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