________________________________________________________________________

This file is part of Logtalk <https://logtalk.org/>  
SPDX-FileCopyrightText: 1998-2025 Paulo Moura <pmoura@logtalk.org>  
SPDX-License-Identifier: Apache-2.0

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
________________________________________________________________________


% start by loading the loading the example:

| ?- logtalk_load(fibonacci(loader)).
...


% NOTE: the example queries below use a SWI-Prolog proprietary predicate 
% time/1 in order to get accurate goal times. This predicate is also found 
% on recent development versions of YAP and XSB. For other Prolog compilers, 
% replace the time/1 call by any appropriate timing calls (e.g., cputime/0).


% calculate 24 Fibonacci number using a single thread:

?- time(fibonacci(1)::fib(24, N)).
% 450,175 inferences, 0.20 CPU in 0.23 seconds (88% CPU, 2250875 Lips)

N = 75025


% calculate the 24 Fibonacci number using two threads:

?- time(fibonacci(2)::fib(24, N)).
% 81 inferences, 0.18 CPU in 0.14 seconds (131% CPU, 450 Lips)

N = 75025


% calculate the 24 Fibonacci number using four threads:

?- time(fibonacci(4)::fib(24, N)).
% 81 inferences, 0.17 CPU in 0.14 seconds (124% CPU, 476 Lips)

N = 75025


% calculate the 24 Fibonacci number using eight threads:

?- time(fibonacci(8)::fib(24, N)).
% 81 inferences, 0.16 CPU in 0.09 seconds (181% CPU, 506 Lips)

N = 75025


% calculate the 24 Fibonacci number using sixteen threads:

?- time(fibonacci(16)::fib(24, N)).
% 81 inferences, 0.16 CPU in 0.08 seconds (206% CPU, 506 Lips)

N = 75025
