#12004: copying a linear program using Coin solver consumes enormous amounts of
memory
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Reporter: john_perry | Owner: ncohen
Type: defect | Status: new
Priority: major | Milestone: sage-4.8
Component: linear programming | Keywords: linear programming, Coin,
copy, memory
Work_issues: | Upstream: N/A
Reviewer: | Author: john_perry
Merged: | Dependencies:
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Comment(by john_perry):
One problem may lie in line 259 of mip.pyx:
{{{
cdef MixedIntegerLinearProgram p =
MixedIntegerLinearProgram(solver="GLPK")
}}}
but changing this does not resolve the problem. In any case, I'm not sure
what's the best way to fix this; `p` has to be initialized to
'''something'''. When I first did it, I initialized `p` by checking
`isinstance(self._backend,...)`, but that leads to import problems if
CPLEX or Coin are not installed. That didn't fix the memory leak, so I
didn't see the point in submitting even a preliminary patch. I could add
an attribute that would indicate what the backend is, but there's probably
a better way.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12004#comment:1>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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