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<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
mso-ansi-language:EN-US'>We have an MPS file that seems to go into an infinite
loop.<span style='mso-spacerun:yes'> </span>We have confirmed this with both
cbc.exe and by <span class=GramE>submitting</span> the MPS file to the <span
class=SpellE>neos</span> server (which timed out after 4 or 5 hours).<span
style='mso-spacerun:yes'> </span>The problem only seems to occur when some
penalty terms in our model <span class=GramE>are violated</span> and large
objective values are produced.<span style='mso-spacerun:yes'> </span>From the
log file it appears as if the optimum solution is found (in a few minutes) but
the post processing <span class=GramE>doesn’t</span> ever finish (if we
turn preprocessing off on cbc.exe we get a solution in a few minutes).<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
mso-ansi-language:EN-US'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
mso-ansi-language:EN-US'>We have found a bug report from </span></font><st1:date
Month="2" Day="16" Year="2007"><span class=GramE><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New";mso-ansi-language:EN-US'>February,</span></font></span><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
mso-ansi-language:EN-US'> 16, 2007</span></font></st1:date><font size=2
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
mso-ansi-language:EN-US'>, that reports an infinite loop in CBC, but <span
class=SpellE>l’m</span> not sure if the bug has been fixed yet, or, if it
has the same cause?<span style='mso-spacerun:yes'> </span>We normally only
update the source code when stable releases are made and we haven’t
updated for a few months, so we were wondering if this is something that could
have been fixed since February?<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
mso-ansi-language:EN-US'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
mso-ansi-language:EN-US'>Thanks for any help,<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
mso-ansi-language:EN-US'>Ricky O'Brien<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-AU style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
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