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/* $Id: statistics.pl,v 1.2 1999/12/20 14:14:07 jan Exp $
Part of SWI-Prolog
Designed and implemented by Jan Wielemaker
Copyright (C) 1999 SWI, University of Amsterdam. All rights reserved.
*/
:- module(prolog_statistics,
[ time/1,
profiler/2,
show_profile/1,
profile/3
]).
:- module_transparent
time/1.
% time(:Goal)
%
% Time the execution of Goal. Possible choice-points of Goal are
% removed.
time(Goal) :-
statistics(cputime, OldTime),
statistics(inferences, OldInferences),
( catch(Goal, E, true)
-> Result = yes
; Result = no
),
statistics(inferences, NewInferences),
statistics(cputime, NewTime),
UsedTime is NewTime - OldTime,
UsedInf is NewInferences - OldInferences - 3,
( UsedTime =:= 0
-> Lips = 'Infinite'
; Lips is integer(UsedInf / UsedTime)
),
print_message(informational, time(UsedInf, UsedTime, Lips)),
( nonvar(E)
-> throw(E)
; Result == yes
).
% profile(-Old, +New)
% change or query profiling status.
profiler(Old, New) :-
'$profile'(OldInt, OldInt),
map_profile(Old, OldInt),
atom(New),
map_profile(New, NewInt), !,
'$profile'(_, NewInt).
profiler(_, New) :-
throw(error(domain_error(profile_type, New), _)).
map_profile(off, 0).
map_profile(cumulative, 1).
map_profile(plain, 2).
% show_profile(N)
% Show the top N functions' profile. Negative numbers or 0 show ALL
% functions that have been called during profiling.
show_profile(N) :-
findall( triple(Perc, Calls, Module:Head),
enum_profile_count(Module:Head, Calls, Perc),
List),
sort(List, Sorted),
reverse(Sorted, HighFirst),
format('~w~t~w =~41|~t~w~57| = ~w ~t~w~79|~n',
[ 'Predicate', 'Box Entries', 'Calls+Redos'
, 'Exits+Fails', 'Time'
]),
format('~61t~79|~n'),
show_profile(N, HighFirst).
enum_profile_count(Head, Calls, Perc) :-
current_predicate(_, Head),
\+ predicate_property(Head, imported_from(_)),
profile_count(Head, Calls, Perc),
Calls \== 0.
show_profile(0, _) :- !.
show_profile(_, []) :- !.
show_profile(N, [triple(Prom, Total, Pred)|Rest]) :-
predicate_name(Pred, Name),
profile_box(Pred, Calls, Redos, Exits, Fails),
format('~w~t~D =~41|~t~D+~D~57| = ~D+~D ~t~1d%~79|~n',
[Name, Total, Calls, Redos, Exits, Fails, Prom]),
succ(M, N),
show_profile(M, Rest).
:- module_transparent
profile/3.
profile(Goal, Style, N) :-
profiler(_, off),
reset_profiler,
profiler(_, Style),
( catch(time(Goal), E, fail)
-> Rval = true
; Rval = fail
),
profiler(_, off),
show_profile(N), !,
( nonvar(E)
-> throw(E)
; Rval == true
).
/*******************************
* MESSAGES *
*******************************/
:- multifile
prolog:message/3.
prolog:message(time(UsedInf, UsedTime, Lips)) -->
[ '~D inferences in ~2f seconds (~w Lips)'-[UsedInf, UsedTime, Lips] ].
:- module_transparent
predicate_name/2.
% predicate_name(+Head, -String)
% Convert `Head' into a predicate name.
predicate_name(Goal, String) :-
'$strip_module'(Goal, Module, Head),
functor(Head, Name, Arity),
( memberchk(Module, [user, system])
-> sformat(String, '~w/~w', [Name, Arity])
; sformat(String, '~w:~w/~w', [Module, Name, Arity])
).
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