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<div class="moz-cite-prefix">I will take a look at it. Trunk stable
??<br>
<br>
John Forrest<br>
<br>
On 08/03/13 20:45, <a class="moz-txt-link-abbreviated" href="mailto:acw@ascent.com">acw@ascent.com</a> wrote:<br>
</div>
<blockquote
cite="mid:OF75B67BFC.43C810E5-ON85257B28.006FCB9E-85257B28.00720CDA@ascent.com"
type="cite"><font face="sans-serif" size="2">I have a model which
I have been trying
to solve thus:</font>
<br>
<br>
<font face="sans-serif" size="2">> ./cbc -threads 4 -import
trouble.mps
-solve -quit</font>
<br>
<br>
<font face="sans-serif" size="2">As you can see, the only even
slightly
exotic thing I'm doing is enabling multithreading, which has
worked fine
for me with less-challenging models.</font>
<br>
<br>
<font face="sans-serif" size="2">Cbc works on this for several
hours
and then segfaults. I tried it three times. On two occasions,
it did about 5.5 M nodes before dying (taking about half a
CPU-day, but
only three or four hours of wallclock time). On the third
occasion,
it managed more than 27 M nodes and 2.5 CPU-days (but only
overnight by
the wall clock).</font>
<br>
<br>
<font face="sans-serif" size="2">On all occasions, the number of
nodes
on the tree rises rapidly to about 93 K, then remains
approximately constant
(within a few hundred) for the rest of the ill-fated run.</font>
<br>
<br>
<font face="sans-serif" size="2">Has anyone else had similar
experiences?</font>
<br>
<br>
<font face="sans-serif" size="2">I have not yet tried running the
model
without multithreading, for obvious practical reasons: it would
probably
take twelve hours if I was lucky, and might take sixty.</font>
<br>
<br>
<font face="sans-serif" size="2">I'll be glad to share the MPS
file (about
a quarter of a meg uncompressed) with anybody who wants to try
this.</font>
<br>
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<br>
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</pre>
</blockquote>
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