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ENHANCED: time/1 now shows the number of inferences #1999

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merged 1 commit into from
Nov 21, 2023
Merged

ENHANCED: time/1 now shows the number of inferences #1999

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77 changes: 50 additions & 27 deletions src/lib/time.pl
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Original file line number Diff line number Diff line change
Expand Up @@ -96,7 +96,7 @@
:- meta_predicate time(0).

:- dynamic(time_id/1).
:- dynamic(time_state/2).
:- dynamic(time_state/3).

time_next_id(N) :-
( retract(time_id(N0)) ->
Expand All @@ -111,9 +111,9 @@
% Reports the execution time of Goal.

time(Goal) :-
'$cpu_now'(T0),
cputime_inferences(T0, I0),
time_next_id(ID),
setup_call_cleanup(asserta(time_state(ID, T0)),
setup_call_cleanup(asserta(time_state(ID, T0, I0)),
( call_cleanup(catch(Goal, E, (report_time(ID),throw(E))),
Det = true),
time_true(ID),
Expand All @@ -123,49 +123,72 @@
; report_time(ID),
false
),
retract(time_state(ID, _))).
retract(time_state(ID, _, _))).

cputime_inferences(T, I) :-
'$cpu_now'(T),
'$inference_count'(I).

time_true(ID) :-
report_time(ID).
time_true(ID) :-
% on backtracking, update the stored CPU time for this ID
retract(time_state(ID, _)),
'$cpu_now'(T0),
asserta(time_state(ID, T0)),
retract(time_state(ID, _, _)),
cputime_inferences(T0, I0),
asserta(time_state(ID, T0, I0)),
false.

report_time(ID) :-
time_state(ID, T0),
'$cpu_now'(T),
time_state(ID, T0, I0),
cputime_inferences(T, I),
Time is T - T0,
Inferences0 is I - I0,
% we must subtract the number of inferences that time/1 itself takes;
% this may have to be adapted if the implementation changes,
% so that (for example) true/1 takes exactly 1 inference.
( bb_get('$answer_count', 0) ->
Inferences is Inferences0 - 60,
Pre = " ", Post = ""
; Pre = "", Post = " "
; Inferences is Inferences0 - 9,
Pre = "", Post = " "
),
format("~s% CPU time: ~3fs~n~s", [Pre,Time,Post]).
phrase((Pre,"% CPU time: ", format_("~3f", [Time]), "s, ",
format_("~U", [Inferences])," inference",s_if_necessary(Inferences),"\n",
Post), Cs),
format("~s", [Cs]).

s_if_necessary(Inferences) -->
{ compare(C, 1, Inferences) },
s_(C).

s_(=) --> "".
s_(<) --> "s".
s_(>) --> " (exception?)".

/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
?- time((true;false)).
%@ % CPU time: 0.006s
%@ true
%@ ; % CPU time: 0.001s
%@ false.
% CPU time: 0.000s, 1 inference
true
; % CPU time: 0.000s, 0 inference (exception?)
false.

:- time(use_module(library(clpz))).
%@ % CPU time: 3.711s
%@ true.
% CPU time: 0.343s, 409_874 inferences
true.

:- time(use_module(library(lists))).
%@ % CPU time: 0.006s
%@ true.
% CPU time: 0.000s, 19 inferences
true.

?- time(member(X, "abc")).
%@ % CPU time: 0.005s
%@ X = a
%@ ; % CPU time: 0.000s
%@ X = b
%@ ; % CPU time: 0.000s
%@ X = c
%@ ; % CPU time: 0.000s
%@ false.
% CPU time: 0.000s, 1 inference
X = a
; % CPU time: 0.000s, 3 inferences
X = b
; % CPU time: 0.000s, 3 inferences
X = c.

?- time((repeat,false)).
% CPU time: 2.726s, 53_330_502 inferences
error('$interrupt_thrown',repl/0).
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
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