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# MIPCOMPONENTS

Description | Determines whether disconnected components in a MIP should be solved as separate MIPs. There can be significant performence benefits from solving disconnected components individual instead of being part of the main branch-and-bound search.
Type | Integer
Topic area | Branch and Bound Search
Values |
-1 | Automatic - let the solver decide.
0 | Disable solving disconnected components separately.
1 | Solve disconnected components separately.
Default value | -1
Notes | If there are no constraints linking two variables, either directly or indirectly through other variables, they are said to belong to two separate disconnected components. When a problem contains disconnected components of signficant size, it can be advantageous to solve each component as a separate MIP. When significant disconnected components are detected in the problem, the solver will switch to a different solve mode where each component is solved separately. This switch will happen after the root node processing has completed and when the solve is about to enter the branch-and-bound search. Solving disconnected components separately is not compatible with many callbacks that can be used for modifying the branch-and-bound search. Setting any of the following callbacks will automatically disable the separate solving of disconnected components: XPRSaddcboptnode, XPRSaddcbprenode, XPRSaddcbchgbranchobject Solving disconnected components separately is not compatible with concurrent MIP solves. If concurrent MIP solves has been turned off, disconnected components will be solved as part of the standard branch-and-bound search in each concurrent solve. Disabling MIP dual reductions through MIPDUALREDUCTIONS will also disable the separate solve of disconnected components.
Affects routines | XPRSmipoptimize ( MIPOPTIMIZE).
See also | PRECOMPONENTS, MIPCONCURRENTSOLVES, XPRSaddcboptnode, XPRSaddcbprenode, XPRSaddcbchgbranchobject
Category | Control

Parent Topic Control Parameters

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