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<DIV><FONT face=Arial size=2>Hi Jennifer,</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I think I may have discovered the area where the
problem lies. Its difficult to prove due to the inconsistency and nature of the
problem.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>1. grads -blc 'myscript.gs' -
produced no seg faults in 10 runs</FONT></DIV>
<DIV><FONT face=Arial size=2>2. grads -b</FONT></DIV>
<DIV><FONT face=Arial size=2>landscape</FONT></DIV>
<DIV><FONT face=Arial size=2>myscript.gs</FONT></DIV>
<DIV><FONT face=Arial size=2>produced seg faults approx 30% of the
time.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>It may just be an anomaly but the software
appears to be more stable with the -blc. This I can live with. Time will tell I
guess.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Regards</FONT></DIV>
<DIV><FONT face=Arial size=2>Steven</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=jma@COLA.IGES.ORG href="mailto:jma@COLA.IGES.ORG">Jennifer Adams</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=GRADSUSR@LIST.CINECA.IT
href="mailto:GRADSUSR@LIST.CINECA.IT">GRADSUSR@LIST.CINECA.IT</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Thursday, March 20, 2008 8:47
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: grads-2.0.a1 segmentation
fault</DIV>
<DIV><FONT face=Arial size=2></FONT><BR></DIV><BR>
<DIV>On Mar 20, 2008, at 1:50 PM, Steven Weiss wrote:<BR
class=Apple-interchange-newline>
<BLOCKQUOTE type="cite">
<DIV style="MARGIN: 0px">Hi Jennifer,</DIV>
<DIV style="MIN-HEIGHT: 14px; MARGIN: 0px"><BR></DIV>
<DIV style="MARGIN: 0px">Yes, I am looping around the time variable and
calling a number of nested</DIV>
<DIV style="MARGIN: 0px">functions that return a string variable which I
print to a file.</DIV>
<DIV style="MARGIN: 0px">The problem is that its inconsistent so its hard to
put the debug code in.</DIV>
<DIV style="MARGIN: 0px">The script is approx 1000 lines. </DIV></BLOCKQUOTE>
<DIV>At the very least you could put something in to say what time step you're
at.</DIV><BR>
<BLOCKQUOTE type="cite">
<DIV style="MARGIN: 0px">There is no core.</DIV></BLOCKQUOTE>Use 'limit
coredumpsize unlimited' to get core files. On a mac, they get put in
/cores <BR>
<BLOCKQUOTE type="cite">
<DIV style="MIN-HEIGHT: 14px; MARGIN: 0px"><BR></DIV>
<DIV style="MARGIN: 0px">I will have to try see if I can catch
it.</DIV></BLOCKQUOTE>Can't really help without more specific info. What data
type are you using??</DIV>
<DIV><BR>
<BLOCKQUOTE type="cite">
<DIV style="MIN-HEIGHT: 14px; MARGIN: 0px"><SPAN class=Apple-style-span
style="-webkit-text-stroke-width: -1">Is there no possibility that you can
run in debug mode e.g. grads --debug?</SPAN></DIV></BLOCKQUOTE>What would you
have 'grads --debug' do for you? </DIV>
<DIV><BR></DIV>
<DIV>You can try running grads inside the GNU debugger... </DIV>
<DIV>> gdb grads</DIV>
<DIV>...</DIV>
<DIV>(gdb) set args -lbc 'myscript.gs'</DIV>
<DIV>(gdb) run</DIV>
<DIV><BR></DIV>
<DIV>... then, when it seg faults, use the 'where' command to find out what
caused the crash. </DIV>
<DIV><BR></DIV>
<DIV>Jennifer</DIV>
<DIV><BR></DIV>
<DIV><BR></DIV>
<DIV><BR></DIV>
<DIV>
<BLOCKQUOTE type="cite">
<DIV style="MIN-HEIGHT: 14px; MARGIN: 0px"><BR></DIV>
<DIV style="MARGIN: 0px">Regards</DIV>
<DIV style="MARGIN: 0px">Steven</DIV>
<DIV style="MIN-HEIGHT: 14px; MARGIN: 0px"><BR></DIV>
<DIV style="MIN-HEIGHT: 14px; MARGIN: 0px"><BR></DIV>
<DIV style="MARGIN: 0px">----- Original Message -----</DIV>
<DIV style="MARGIN: 0px">From: "Jennifer Adams" <<A
href="mailto:jma@COLA.IGES.ORG">jma@COLA.IGES.ORG</A>></DIV>
<DIV style="MARGIN: 0px">To: <<A
href="mailto:GRADSUSR@LIST.CINECA.IT">GRADSUSR@LIST.CINECA.IT</A>></DIV>
<DIV style="MARGIN: 0px">Sent: Thursday, March 20, 2008 6:28 PM</DIV>
<DIV style="MARGIN: 0px">Subject: Re: grads-2.0.a1 segmentation fault</DIV>
<DIV style="MIN-HEIGHT: 14px; MARGIN: 0px"><BR></DIV>
<DIV style="MIN-HEIGHT: 14px; MARGIN: 0px"><BR></DIV>
<BLOCKQUOTE type="cite">
<DIV style="MARGIN: 0px">On Mar 20, 2008, at 8:10 AM, Steven Weiss
wrote:</DIV>
<DIV style="MIN-HEIGHT: 14px; MARGIN: 0px"><BR></DIV>
<BLOCKQUOTE type="cite">
<DIV style="MARGIN: 0px">Hi,</DIV>
<DIV style="MIN-HEIGHT: 14px; MARGIN: 0px"><BR></DIV>
<DIV style="MARGIN: 0px">I'm running grads 2.0.a1 on Suse Linux and
every so often I get a</DIV>
<DIV style="MARGIN: 0px">segmentation fault. Its very inconsistent. The
only thing I can see</DIV>
<DIV style="MARGIN: 0px">is that</DIV>
<DIV style="MARGIN: 0px">it is always during writing out a file. i.e.
rc= write (filename,</DIV>
<DIV style="MARGIN: 0px">variable).</DIV>
<DIV style="MARGIN: 0px">From looking at the file, the variable data is
normally only half</DIV>
<DIV style="MARGIN: 0px">written</DIV>
<DIV style="MARGIN: 0px">and the problem is not always in the same
place.</DIV>
<DIV style="MIN-HEIGHT: 14px; MARGIN: 0px"><BR></DIV>
<DIV style="MARGIN: 0px">How can I go about identifying what the problem
is?</DIV></BLOCKQUOTE>
<DIV style="MARGIN: 0px">Well ...</DIV>
<DIV style="MARGIN: 0px">I can't fix I bug I can't reproduce, so you have
to find a way to get</DIV>
<DIV style="MARGIN: 0px">GrADS to seg fault reliably. Try putting some
debugging statements in</DIV>
<DIV style="MARGIN: 0px">your script so you'll know where it's dying, e.g.
if it happens</DIV>
<DIV style="MARGIN: 0px">during a loop. There are some known problems in
2.0.a1 that have</DIV>
<DIV style="MARGIN: 0px">already been addressed ... what data type are you
using?</DIV>
<DIV style="MIN-HEIGHT: 14px; MARGIN: 0px"><BR></DIV>
<DIV style="MARGIN: 0px">If you've got a core file, you can try using gdb
(gnu debugger) to</DIV>
<DIV style="MARGIN: 0px">see where it died:</DIV>
<DIV style="MARGIN: 0px">> gdb grads</DIV>
<DIV style="MARGIN: 0px">...</DIV>
<DIV style="MARGIN: 0px">(gdb) core your.core.filename</DIV>
<DIV style="MIN-HEIGHT: 14px; MARGIN: 0px"><BR></DIV>
<DIV style="MARGIN: 0px">Then gdb will say where in the GrADS code it was
when it seg faulted.</DIV>
<DIV style="MIN-HEIGHT: 14px; MARGIN: 0px"><BR></DIV>
<DIV style="MARGIN: 0px">Jennifer</DIV></BLOCKQUOTE></BLOCKQUOTE></DIV><BR>
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<DIV>--</DIV>
<DIV>Jennifer M. Adams</DIV>
<DIV>IGES/COLA</DIV>
<DIV>4041 Powder Mill Road, Suite 302</DIV>
<DIV>Calverton, MD 20705</DIV>
<DIV><A href="mailto:jma@cola.iges.org">jma@cola.iges.org</A></DIV>
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