Gecode::Search::Options Class Reference
Search engine options
List of all members.
Public Member Functions
| ||Options (void)|
| ||Initialize with default values. |
|Options ||expand (void) const |
| ||Expand with real number of threads. |
| ||Whether engines create a clone when being initialized. |
| ||Number of threads to use. |
|unsigned int ||c_d|
| ||Create a clone after every c_d commits (commit distance). |
|unsigned int ||a_d|
| ||Create a clone during recomputation if distance is greater than a_d (adaptive distance). |
|unsigned int ||d_l|
| ||Discrepancy limit (for LDS). |
|unsigned int ||assets|
| ||Number of assets (engines) in a portfolio. |
|unsigned int ||slice|
| ||Size of a slice in a portfolio (in number of failures). |
|unsigned int ||nogoods_limit|
| ||Depth limit for extraction of no-goods. |
|Stop * ||stop|
| ||Stop object for stopping search. |
|Cutoff * ||cutoff|
| ||Cutoff for restart-based search. |
|SearchTracer * ||tracer|
| ||Tracer object for tracing search. |
Static Public Attributes
|static const Options ||def|
| ||Default options. |
Search engine options
Defines options for search engines. Not all search engines might honor all option values.
- c_d as minimal recomputation distance: this guarantees that a path between two nodes in the search tree for which copies are stored has at least length c_d. That is, in order to recompute a node in the search tree, c_d recomputation steps are needed. The minimal recomputation distance yields a guarantee on saving memory compared to full copying: it stores c_d times less nodes than full copying.
- a_d as adaptive recomputation distance: when a node needs to be recomputed and the path is longer than a_d, an intermediate copy is created (approximately in the middle of the path) to speed up future recomputation. Note that small values of a_d can increase the memory consumption considerably.
Full copying corresponds to a maximal recomputation distance c_d of 1.
All recomputation performed is based on batch recomputation: batch recomputation performs propagation only once for an entire path used in recomputation.
The number of threads to be used is controlled by a double (assume that is the number of processing units available). If , threads are chosen (of course with rounding). If , then threads are chosen (all but processing units get a thread). If is zero, threads are chosen. If , threads are chosen. If , threads are chosen.
Definition at line 744 of file search.hh.
Constructor & Destructor Documentation
Member Function Documentation
Expand with real number of threads.
Definition at line 43 of file options.cpp.
Member Data Documentation
Whether engines create a clone when being initialized.
Definition at line 747 of file search.hh.
Number of threads to use.
Definition at line 749 of file search.hh.
Create a clone after every c_d commits (commit distance).
Definition at line 751 of file search.hh.
Create a clone during recomputation if distance is greater than a_d (adaptive distance).
Definition at line 753 of file search.hh.
Number of assets (engines) in a portfolio.
Definition at line 757 of file search.hh.
Size of a slice in a portfolio (in number of failures).
Definition at line 759 of file search.hh.
Depth limit for extraction of no-goods.
Definition at line 761 of file search.hh.
The documentation for this class was generated from the following files: