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Logtalk - Object oriented extension to Prolog
Release 2.21.4

Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
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% start by loading the example:

| ?- logtalk_load(loader).
...


% call the built-in control construct true/0 to measure the overhead of the 
% benchmark/1 predicate itself:

| ?- benchmark(true).

Number of repetitions: 1000000
Average time per call: 5.1e-07 seconds
Number of calls per second: 1960784.31372549
yes


% call the predicate my_length/0 defined in the Prolog database:

| ?- benchmark(my_length([1, 2, 3, 4, 5, 6, 7, 8, 9, 0], _)).

Number of repetitions: 1000000
Average time per call: 3.07e-06 seconds
Number of calls per second: 325732.899022801
yes


% call the predicate module:mod_length/2 from top-level:

| ?- benchmark(module:mod_length([1, 2, 3, 4, 5, 6, 7, 8, 9, 0], _)).

Number of repetitions: 1000000
Average time per call: 3.17e-06 seconds
Number of calls per second: 315457.413249211
yes


% call the predicate list::length/2 from top-level:

| ?- benchmark(object::length([1, 2, 3, 4, 5, 6, 7, 8, 9, 0], _)).

Number of repetitions: 1000000
Average time per call: 9.14e-06 seconds
Number of calls per second: 109409.190371991
yes


% compiled call of the predicate list::length/2 (simulates message sending 
% from a compiled object to another object; thus no top-level overhead):

| ?- benchmark('$lgt_send_to_object_nv'(object, length([1, 2, 3, 4, 5, 6, 7, 8, 9, 0], _), user)).

Number of repetitions: 1000000
Average time per call: 5.1e-06 seconds
Number of calls per second: 196078.431372549
yes