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Groups > comp.lang.prolog > #14790
| From | Mild Shock <janburse@fastmail.fm> |
|---|---|
| Newsgroups | comp.lang.prolog |
| Subject | WebPL is an interesting project (Was: SWI-Prolog is still the OG of GC) |
| Date | 2025-08-17 18:00 +0200 |
| Message-ID | <107sua1$69ve$1@solani.org> (permalink) |
| References | (1 earlier) <107fqjo$3m3hh$1@solani.org> <107kduo$10b9$1@solani.org> <107pik3$4csp$1@solani.org> <107pjag$4dc8$1@solani.org> <107pk1o$4e0v$1@solani.org> |
Hi,
The paper by Shalin and Carlson from 1991
did not yet ring a bell. But it suggest testing
something with primes and freeze. Lets do
primes as suggested but without freeze. SWI-Prolog
seems not to the OG of GC. Putting aside Shalin
and Carlson, its an typical example of a lot of
intermediate results, that can be discarded by
a garbage collection. Every candidate number that
is not a prime number can be remove from the
trail they get unreachable in the first clause
of search/3. Besides this obvious unreachability
task, I don't have statistics or don't see immediately
where large variable instantiation chains are supposed
to be created. At least not in my Prolog system, since
a result variable is passed without binding it to a
local variable, this "shunting" happens independent
of neck tests and the "shunting" there. The result variable
passing is extremly simple to implement and could
be what is effective here besides the reachability thingy.
At least the 1 ms GC time in Dogelog Player show that
the reachability thingy is the minor effort or optimization
to get nice performance:
/* WebPL GC */
(1846.1ms)
/* Dogelog Player 1.3.6 for JavaScript (16.08.2025) */
% Zeit 2992 ms, GC 1 ms, Lips 2514202, Uhr 17.08.2025 17:44
/* SWI-Prolog WASM */
(4204.2ms)
/* Trealla Prolog WASM */
(23568.9ms)
The test code was:
test :-
len(L, 1000),
primes(L, _).
primes([], 1).
primes([J|L], J) :-
primes(L, I),
K is I+1,
search(L, K, J).
search(L, I, J) :-
mem(X, L),
I mod X =:= 0, !,
K is I+1,
search(L, K, J).
search(_, I, I).
mem(X, [X|_]).
mem(X, [_|Y]) :-
mem(X, Y).
len([], 0) :- !.
len([_|L], N) :-
N > 0,
M is N-1,
len(L, M).
Bye
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Re: Prolog Education Group clueless about the AI Boom? Mild Shock <janburse@fastmail.fm> - 2025-03-03 14:20 +0100
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Re: ILP is still dreaming of higher order (Was: Prolog Education Group clueless about the AI Boom?) Mild Shock <janburse@fastmail.fm> - 2025-03-08 00:00 +0100
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