The following predicates can be used to access execution statistics.
fd_statistics
fd_statistics(?Key, ?Value)
This allows a program to access execution statistics specific to this
solver. General statistics about CPU time and memory consumption etc.
is available from the built-in predicate statistics/2
.
Without arguments, displays on the standard error stream a summary of the following statistics, and zeroes all counters. With arguments, for each of the possible keys Key, Value is unified with the current value of a counter, which is simultaneously zeroed. The following counters are maintained:
resumptions
The number of times a constraint was resumed.
entailments
The number of times a (dis)entailment was detected by a constraint.
prunings
The number of times a domain was pruned.
backtracks
The number of times a contradiction was found by a domain being wiped out, or by a global constraint signalling failure. Other causes of backtracking, such as failed Prolog tests, are not covered by this counter.
constraints
The number of propagators created.