Initializing help system before first use

# 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
Note | 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.
Note | 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
Note | 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.
Note | 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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