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<TITLE>NWChem Frequently Asked Questions</TITLE>
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<td align="left" width="325"><img src="../../images/nwchem_logo_dark.gif" border=0 width=200 alt="NWChem - computational chemistry on parallel computers"></td>
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<td width="300" align="right"><a href="itanium.html">Next FAQ Catagory</a> | <a href="NWChem_FAQ.html">Return to Main FAQ</a></td>
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<br><br>
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<h1>NWChem FAQ</h1>
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<p><h2>SGI</h2></p>
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<!--DO NOT REMOVE Begin Question and End Question Comments.-->
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<ul>
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<!--Begin Question-->
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<li><a href="#0">How can I improve parallel performances under SGI? </a></li>
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<li><a href="#1">How can I improve performances under SGITFP? </a></li>
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<li><a href="#2">How do I install the MPI version of SGITFP? </a></li>
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<!--End Question-->
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</ul>
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<hr>
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<p>
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<a name="sgimpi"></a>
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<font color="purple">How can I improve parallel performances under SGI?</font>
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<p>Use the MPI vendor library, after defining the usual environmental
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variable to replace TCGMSG with MPI
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<pre>
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USE_MPI=y
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</pre>
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<p>
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<hr>
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<a name="sgitfpscs"></a>
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<font color="purple">How can I improve performances under SGITFP?</font>
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<p>Install the SCSL scientific library, freely available from the <a href="http://www.sgi.com/software/scsl.html" target="_blank"> SGI web site </a>, then link the
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code with the following environmental variable
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<pre>
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BLASOPT=-lscs_blas_i8
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</pre>
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</p>
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<hr>
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<p>
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<a name="sgitfpmpich"></a>
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<font color="purple">How do I install the MPI version of SGITFP?</font>
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<p> You need to have installed a 64-bit version of MPICH. In order to
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do that, you need to run configure with the following arguments
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<pre>
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./configure --with-arch=IRIX64 --with-device=ch_p4 ---prefix=/usr/local\
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--disable-f90 --disable-f90modules
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</pre>
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</font>
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<hr>Contact: <a href="mailto:ms3distribution@emsl.pnl.gov">NWChem Support</a><br>
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Updated: February 22, 2005
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