Am 21.02.2016 um 22:57 schrieb Chris Matrakidis:
With glpk compiled using "-O1 -msse3 -mfpmath=sse" on a 32 bit system
with gcc 4.6.1 and running:
glpsol --bestp --nointopt water.mps
I was able to reproduce an error that was reported earlier:
http://lists.gnu.org/archive/html/bug-glpk/2016-01/msg00000.html
The last lines of output were:
Integer optimization begins...
+ 198: mip = not found yet >= -inf (1; 0)
Error: unable to factorize the basis matrix (1)
Constructing initial basis...
Size of triangular part is 521
+ 23751: mip = not found yet >= 8.372570868e+004 (916; 2246)
+ 49757: mip = not found yet >= 8.372570868e+004 (1518; 4753)
+ 75846: mip = not found yet >= 8.372570868e+004 (2031; 7453)
Assertion failed: tcol[csa->p] != 0.0
Error detected in file simplex/spydual.c at line 999
Yeah!!! Since posting my issue i've collected at least two LPs which let
GLPK crash with this error. The bad thing is that the crash only occures
when I call GLPK from my Java-application via java-glpk. Writing the
completely created LP to disk with glp_write_prob() and letting glpsol
int-opt the LP, with apparently the same parameters as used in my Java
application, never caused the crash. Made me crazy not being able to
reproduce the problem in a viable manner. I'm so glad you found an LP to
reproduce!
The cycling I have noticed too, but it occues much less than the spydual
crash in my cases and i wasn't able to collect causing LPs.
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