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<TITLE>NWChem Known Bugs in version 4.5</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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<a href="../nwchem_main.html">NWChem Home</a> |
<a href="../disclaimer.html">Security & Privacy</a> |
<a href="http://www.pnl.gov" target="_blank">PNNL</a>
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<hr>
<h1>NWChem Known Bugs in version 4.5</h1>
It is recommended that users use the defaults in NWChem.
They have been set to provide maximum efficiency for most users.
If you feel you must change one of the defaults, be aware that
you are responsible for ensuring that the results are correct.
<p>
Below is a list of the known bugs in NWChem 4.5 beta. If you believe
that you have found bugs that are not listed here, please
send your bug report using the correct channel listed in the
<a href="support.html">Reporting Problems with NWChem page</a>.
<ol>
<li> <a href="#0">Direct MP2 optimizations</a></li>
<li> <a href="#1">COSMO gives incorrect results</a></li>
<li> <a href="#2">Quantum molecular dynamics only works for SCF and DFT</a></li>
<li> <a href="#3">Problem with RHF GIAO calculations on TMS molecules using basis sets that contain d functions</a></li>
<li> <a href="#4">SCF lock directive broken in parallel runs</a></li>
<li> <a href="#5">Problem in TI/PME evaulations</a></li>
<li> <a href="#6">Compile problem on Sun processors with workshop 4.2</a></li>
<li> <a href="#7">Possible compile problems with True64 Compaq Fortran</a></li>
<li> <a href="#8">Medium and large size calculation under Linux produce NaNs</a></li>
<li> <a href="#9">GM versions before 1.3 cause compilation errors</a></li>
</ol>
<p>
<hr><br>
<hr>
<p>
<a name="0"></a><font color="purple">Direct MP2 optimizations:</font></p>
<p>
MP2 optimizations that are performed with the direct option can
have problems with CPHF convergence. In this case, the user is
advised to use the default options which is a semi-direct calculation.</p>
<hr>
<p><a name="1"></a><font color="purple">COSMO gives incorrect results</font></p>
<p>
The COSMO model will give incorrect results for the solvation energy. In
addition one of the options necessary has not been defined in the user
manual. In order to obtain the same results as the NWChem 4.0.1 version
the user should define the following parameters in the cosmo input block:
<br><br>
ifscrn 2<br>
iscren 0<br><br>
The problem will be resolved in the next release of NWChem.</p>
<! Michel is going to fix this>
<hr>
<p><a name="2"></a><font color="purple">Quantum molecular dynamics only works for SCF and DFT</font></p>
<p>
A fix is now available upon request from
<a href="mailto:nwchem-support@emsl.pnl.gov?subject=QMD theory fix">
nwchem-support@emsl.pnl.gov</a>.</p>
<! src/task/task_dynamics.F 1.7>
<hr>
<p><a name="3"></a><font color="purple">Problem with RHF GIAO calculations on TMS molecules using basis sets that contain d functions</font></p>
<p>A fix will be available in the next release.</p>
<hr>
<p><a name="4"></a><font color="purple">SCF lock directive broken in parallel runs</font></p>
<p>A fix will be available in the next release.</p>
<hr>
<p><a name="5"></a><font color="purple">Problem in TI/PME evaulations</font></p>
<p>A fix will be available in the next release.</p>
<hr>
<p>
<a name="6"></a><font color="purple">Compile problem on Sun processors with workshop 4.2</font></p>
<p>
The user will get a fatal error when compiling
nwchem/src/util/errquit.F that can be resolved by removing
the -DJOBTIMEPATH definition in the GNUmakefile in the util directory.
A better solution is to upgrade to at least workshop 5.0.</p>
<hr>
<p><a name="7"></a><font color="purple"> Possible compile problems with True64 Compaq Fortran</font></p>
<p>
Some versions of True64 Compaq Fortran default f77 to point to f90 and
the compile will break because of problems with cpp and f90. This has
been reported for V5.3-915. There are three known solutions:
<ol>
<li>Change the f77 link to point to f77 instead of f90,</li>
<li>Add the flag -old_f77 as the first flag in the FC definition of the
DECOSF section of the $NWCHEM_TOP/src/config/makefile.h file, or</li>
<li>Upgrade to version X5.3-1155 plus the patches at <a href="http://www6.compaq.com/fortran/dfau.html#updates">
http://www6.compaq.com/fortran/dfau.html#updates</a>.</li>
</ol></p>
<hr>
<p>
<a name="8"></a><font color="purple">Medium and large size calculation under Linux produce NaNs</font></p>
<p>
2.2 Linux kernels are known to produce random wrong
floating point arithmetic (eventually causing NaNs), see for example:
<p><a href="http://www.ccl.net/cgi-bin/ccl/message.cgi?2000+06+06+002">http://www.ccl.net/cgi-bin/ccl/message.cgi?2000+06+06+002</a>
<br><a href="http://www.ccl.net/cgi-bin/ccl/message.cgi?2001+02+23+012"> http://www.ccl.net/cgi-bin/ccl/message.cgi?2001+02+23+012</a>
<br><a href="http://www.uwsg.indiana.edu/hypermail/linux/kernel/0104.2/0814.html"> BUG: Global FPU corruption in 2.2</a>
<br><a href="http://www.cs.helsinki.fi/linux/linux-kernel/2001-16/0641.html">
Re: BUG: Global FPU corruption in 2.2</a><p>
<p>We have experienced the same problems running NWChem with a 2.2.x kernel.
This is likely due to FPU problems that has been fixed in kernel
2.2.20 and in the 2.4 series.</p>
To fix the problem, we strongly suggest you to install 2.4.x
kernels available at
<p><a href="http://www.kernel.org/pub/linux/kernel/v2.4/">http://www.kernel.org/pub/linux/kernel/v2.4/</a></p>
<p>
or to upgrade your 2.2 kernel to version 2.2.20, whose source is
available at</p>
<p>
<a href="http://www.kernel.org/pub/linux/kernel/v2.2/linux-2.2.20.tar.gz">http://www.kernel.org/pub/linux/kernel/v2.2/linux-2.2.20.tar.gz</a></p>
<hr>
<p><a name="9"></a><font color="purple">GM versions before 1.3 cause compilation errors</font></p>
<p>
If you are using a version of GM more recent than 1.3, you are going to experience a
compilation error, to avoid this you need to edit
<tt>$NWCHEM_TOP/src/tools/armci/src/myrinet.c</tt> adding this line</p>
<p>
<tt>#define GM_STRONG_TYPES 0</tt></p>
<p>
just before</p>
<p>
<tt>#include "gm.h"</tt></p>
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Created by Theresa Windus<br>
Updated : Fri Apr 11 14:44:19 PDT 2003
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