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<LI><A NAME="tex2html1329"
HREF="node63.html#SECTION000136010000000000000">12.6.0.1 Why is my job crashing with ``segmentation fault''?</A>
<LI><A NAME="tex2html1330"
HREF="node63.html#SECTION000136020000000000000">12.6.0.2 Why is the code saying <EM>Wrong atomic coordinates</EM>?</A>
<LI><A NAME="tex2html1331"
HREF="node63.html#SECTION000136030000000000000">12.6.0.3 The code stops with an <EM>error in davcio</EM></A>
<LI><A NAME="tex2html1332"
HREF="node63.html#SECTION000136040000000000000">12.6.0.4 The code stops with a <EM>wrong charge</EM> error</A>
<LI><A NAME="tex2html1333"
HREF="node63.html#SECTION000136050000000000000">12.6.0.5 The code stops with a mysterious error in IOTK</A>
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<H2><A NAME="SECTION000136000000000000000">
12.6 Frequent errors during execution</A>
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<H4><A NAME="SECTION000136010000000000000">
12.6.0.1 Why is my job crashing with ``segmentation fault''?</A>
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<P>
Possible reasons: too much memory requested; executable or libraries
fitted to a different hardware; code bug; compiler bug. The latter are
typically not reproducible on different architectures or compilers;
code bugs may sometimes be elusive, but typically yield a more
reproducible, pattern of problems.
<P>
Mysterious, unpredictable, erratic errors in parallel execution are
almost always coming from bugs in the compiler or/and in the MPI
libraries and sometimes even from flaky hardware. Sorry, not our fault.
<P>
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12.6.0.2 Why is the code saying <EM>Wrong atomic coordinates</EM>?</A>
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Because they are: two or more atoms in the list of atoms have
overlapping, or anyway too close, positions. Can't you see why? look better
(or use XCrySDen: see above) and remember that the code checks periodic
images as well.
<P>
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12.6.0.3 The code stops with an <EM>error in davcio</EM></A>
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Possible reasons: disk is full; <TT>outdir</TT> is not writable for
any reason; you changed some parameter(s) in the input (like
<TT>wf_collect</TT>, or the number of processors/pools) without
doing a bit of cleanup in your temporary files; you were running
more than one instance of <TT>pw.x</TT> in the same temporary
directory with the same file names.
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12.6.0.4 The code stops with a <EM>wrong charge</EM> error</A>
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In most cases: you are treating a metallic system
as if it were insulating.
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12.6.0.5 The code stops with a mysterious error in IOTK</A>
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IOTK is a toolkit that reads/writes XML files. There are frequent
reports of mysterious errors with IOTK not finding some variable
in the XML data file. If this error has no obvious explanation
(e.g. the file is properly written and read, the searched variable
is present, etc) and if it appears to be erratic or irreproducible
(e.g. it occurs only with version X of compiler Y), it is almost
certainly due to a compiler bug. Try to reduce optimization level,
or use a different compiler. If you paid real money for your
compiler, complain with the vendor.
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