HEURBEFORELP
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Description
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Branch and Bound: Determines whether primal heuristics should be run before the initial LP relaxation has been solved.
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Type
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Integer
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Values
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Default value
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-1
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Note
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It is possible that a heuristic will find an optimal integer solution that will result in the LP relaxation solution being cut off. If the problem is solved with the "
l" flag to
XPRSmipoptimize (i.e., stop after solving the LP relaxation), then
LPSTATUS might be returned as
XPRS_LP_CUTOFF or
XPRS_LP_CUTOFF_IN_DUAL.
If dedicated heuristic threads are enabled through the HEURTHREADS control, then the initial heuristics will be run in parallel with the LP solve, instead of before. |
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Affects routines
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See also
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