Initializing help system before first use

# PREROOTEFFORT

Description | Dial for the work spent during the Pre-root parallel heuristic phase. A positive value sets a suitable work limit that is dependent on problem-characteristics. Changing the value up/or down dials the work spent in this phase up or down. This control also enables/disables Pre-root parallel heuristics.
Type | Double
Topic areas | Parallel, Heuristics, Limits
Values |
-2 | Enable Pre-root parallel heuristics without a specific work limit for this phase. The phase will terminate if a different limit is hit, or if it runs out of heuristic work to do.
-1 | Enablement of Pre-root parallel heuristics is subject to HEUREMPHASIS.
0 | Disable Pre-root parallel heuristics.
x>0 | Enable Pre-root parallel heuristics with a work limit dependent on problem characteristics, using x as a factor to dial this work limit up or down.
Default value | -1
Note | The special value of -2 does not use a phase-specific work limit at all. Make sure to use other limits to stop the Pre-root parallel phase eventually.
Note | If a WORKLIMIT on the overall solution process has been set, it also applies during the pre-root parallel phase.
Note | This control always sets a work limit that depends on the characteristics of the presolved problem. If you prefer to set an absolute work limit instead, consider the control PREROOTWORKLIMIT.
Affects routines | XPRSoptimize ( OPTIMIZE)
See also | PREROOTWORKLIMIT, HEUREMPHASIS
Category | Control

Parent Topic Control Parameters

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