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948 discussions

Re: Database and memory limitations
by Roel Wuyts 12 Dec '01

12 Dec '01

In my PhD I did a similar thing, but I worked in Smalltalk and integrated my Prolog to eliminate this kind of overhead (I talked directly to my Smalltalk image instead of having to create a separate repository). I don't know if that's possible in your approach. For what I needed to do this was needed and sufficient (the integration served other purposes as weel, on which I'm not going to dwell right now :-) ). My colleague, however, was doing work with checking software architectures against the implementation, and for that my logic language was too slow. We then used a 'regular Prolog (WinProlog at that time), and an ODBC connection to a relational database where we stored the full parse tree information. I think that this setup could be very useful in your approach. More information can be found in my dissertation (http://www.iam.unibe.ch/~wuyts/ARTICLES/WuytsPhd.pdf) or in Kim Mens' dissertation (http://prog.vub.ac.be/Research/ResearchPublicationsDetail2.asp?paperID=82) On woensdag, december 12, 2001, at 12:51 , Dupont, Michael wrote: > > Dear Ciao Users, > > I have been experimenting with using prolog as a repository for program > meta > information of c++ programs. > Concretly i have exported the parse trees from the gcc compiler into > XML, > translated them into a prolog program using xslt and then read them > into by > compiling the program. > > I have the following predicate structure > node(id,type) > node(id,attribute,value) > node(fromid,relationship,toid) > > The problem that i have is following, > the number of nodes is maxing out the system (100,000-1,000,000 nodes > with > 5-25 relationships per node). > > Can you tell me of ways to use prolog, but to use it on datasets that > are > large? > Specifically i have would like to using prolog to query the dataset and > write queries. > > Thanks in advance, > > mike > > Roel Wuyts Software Composition Group roel.wuyts(a)iam.unibe.ch University of Bern, Switzerland http://www.iam.unibe.ch/~wuyts/ Board Member of the European Smalltalk User Group: www.esug.org

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Re: Database and memory limitations
by Manuel Carro 12 Dec '01

12 Dec '01

Hiya Michael, First off, I'm not an experienced Prolog coder, so my reply may well be naive, and in which case feel free to simply bin it. When evaluating several Prologs I noted that most had configs for memory usage (heap etc), and indeed a couple of times I had to raise these settings in order to run tests... might there be a similar issue here? I find it of interest that you are transforming xml datasets into prolog with xsl... specifically the reason your snippet caught my eye is I'm about to try out some previous work with Topic Navigation Maps with Prolog (which is new to me), well basically to see what fits well and what doesn't. If you do find a solution I'd be appreciative as after xmas I was going to throw a large dataset at Ciao to see how it went (DMoz), and from the sounds of it the answer would be not very far. Sorry I can't be of any substantial help, and thanks for any follow-up you're able to give. Regards, Guy Murphy. ----- Original Message ----- From: "Dupont, Michael" <michael.dupont(a)mciworldcom.de> To: <ciao-users(a)clip.dia.fi.upm.es> Sent: Wednesday, December 12, 2001 11:51 AM Subject: Database and memory limitations > > Dear Ciao Users, > > I have been experimenting with using prolog as a repository for program meta > information of c++ programs. > Concretly i have exported the parse trees from the gcc compiler into XML, > translated them into a prolog program using xslt and then read them into by > compiling the program. > > I have the following predicate structure > node(id,type) > node(id,attribute,value) > node(fromid,relationship,toid) > > The problem that i have is following, > the number of nodes is maxing out the system (100,000-1,000,000 nodes with > 5-25 relationships per node). > > Can you tell me of ways to use prolog, but to use it on datasets that are > large? > Specifically i have would like to using prolog to query the dataset and > write queries. > > Thanks in advance, > > mike > MCL _____________________________________________________________ All I want is a warm bed and a kind word and unlimited power.

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Database and memory limitations
by Dupont, Michael 12 Dec '01

12 Dec '01

Dear Ciao Users, I have been experimenting with using prolog as a repository for program meta information of c++ programs. Concretly i have exported the parse trees from the gcc compiler into XML, translated them into a prolog program using xslt and then read them into by compiling the program. I have the following predicate structure node(id,type) node(id,attribute,value) node(fromid,relationship,toid) The problem that i have is following, the number of nodes is maxing out the system (100,000-1,000,000 nodes with 5-25 relationships per node). Can you tell me of ways to use prolog, but to use it on datasets that are large? Specifically i have would like to using prolog to query the dataset and write queries. Thanks in advance, mike

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Constraints in Ciao Prolog
by Alexandre Saidi 12 Dec '01

12 Dec '01

Hi, Is there any change on CLP (by IBM) made many years ago. Ciao manual don't say anything about other sources. Thanks.

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Re: ODBC Mediator? (repeat post due to foul up)...
by Manuel Carro 07 Dec '01

07 Dec '01

>> Can anybody point me to the ODBC Mediator for Ciao... it's not >> included in either the most current distro or the "stable" distro... a >> degree of ODBC support was one of the reasons I chose Ciao, I'm liking >> it and would regret having to ditch it over ODBC. Hi. There has been some other requests for ODBC. In the last times we have been paying more attention to connection to other databases such as MySQL, and lack of resources impeded working in lock step in all the database variants. The ODBC mediator was in fact working quite well, but its architecture (a separate process was needed to access the ODBC databases over the net), but we did not want to include in a (stable) distribution without making sure that an high degree of reliability and transparency from the Prolog side w.r.t. the back-end database was achieved. We want, however, to give a push to database access, and have the ability to interoperate with differents types/brands of external databases with basically the same Prolog view. The intricacies of the existing database variants (MySQL, ODBC, PostGres, ...) will, however, take some time to pin down and work out correctly. We ask all users interested in database access (we ourselves are interested!) to bear with us in the meantime---or to join in in order to make this time as short as possible. MCL & the Ciao team _________________________________________ Noalias must go. This is non-negotiable.

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Documentation in spanish?
by rey＠cepes.uh.cu 07 Dec '01

07 Dec '01

Hello: Before starting my work with CiaoProlog, I was searching for related information. Is there any source of it in spanish? Should be... -- Saludos, Rey.

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ODBC Mediator? (repeat post due to foul up)...
by Guy Murphy 27 Nov '01

27 Nov '01

[ sorry for the repeat post, but system clock was out of whack and likley yo result in my post getting berried undre a pile of e-mail ] ---- Hiyas. Can anybody point me to the ODBC Mediator for Ciao... it's not included in either the most current distro or the "stable" distro... a degree of ODBC support was one of the reasons I chose Ciao, I'm liking it and would regret having to ditch it over ODBC. Oh, windows binaries along with source would be a dream, but I'll settle for source =) Cheers, Guy

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Re: Trouble with module which wants to import and export
by Daniel Cabeza Gras 26 Nov '01

26 Nov '01

Dear Greg, The solution depends on the exact scenario. If there is only one client module, and it has a fixed name, then doing the client an the search module mutually dependent with normal use_module declarations will suffice. I suppose the problem is that the client module name may change, and possibly that there can be multiple client modules. If there is only one client module, then declaring :- multifile successor/2. both in the client and the search module will do the trick. This is not correct if there can be multiple client modules, because the successor/2 clauses will got merged. The really nice thing in that case would be to use Ciao's higher-order capabilities, adding to path/3 a higher-order argument to hold the predicate to call. As an example, lets suppose the path/3 code would be as simple as: path(Start, Start, []). path(Start, End, [Next|RestPath]) :- successor(Start, Next), path(Next, End, RestPath). The new path/4 code would be: :- meta_predicate path(_,_,pred(2),_). path(Start, Start, _Succ, []). path(Start, End, Succ, [Next|RestPath]) :- Succ(Start, Next), % equivalent to call(Succ, Start, Next) path(Next, End, Succ, RestPath). and in the client, if locally is defined successor/2 (any name possible), the call to path/4 would be: ... path(E0, Ef, successor, Path) ... Note that in the coming Ciao version (but not in 1.6), to use higher order the hiord package is needed, so a declaration as :- use_package(hiord). would be needed in the path/4 module source. Regards, Daniel Cabeza

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Re: Trouble with module which wants to import and export
by Manuel Carro 26 Nov '01

26 Nov '01

>> I'm trying to port some Prolog code I wrote some time ago >> to Ciao and I'm having trouble figuring out the right way to >> use the Ciao module system. I have some path searching modules >> which have the following interface; >> >> % Requires: >> % successor( Given state, Successor state ). >> % Provides: >> % path( Given start state, Given goal state, Path from start to goal ). >> >> That is, they import successor/2 from the domain code >> (the client module) and provide path/3 back. >> >> I'm not figuring out how to write these mutually dependent modules. >> What am I missing? Can't you just write them as the samples below (and please correct me if I misunderstood anything): File a.pl: ___________________________________________________________________________ :- module(a, [whatever/0]). :- use_module(b). whatever:- whichever. ___________________________________________________________________________ File b.pl: ___________________________________________________________________________ :- module(b, [whichever/0]). :- use_module(a). whichever:- whatever. ___________________________________________________________________________ These above are accepted by Ciao Prolog, even if mutually dependent. -- || Manuel Carro -- DLSIIS || || e-mail: mcarro(a)fi.upm.es || || http://lml.ls.fi.upm.es/~boris || || http://clip.dia.fi.upm.es/Software/Ciao || || Phone: +34 91 336-7455 FAX: +34 91 336-7412 ||

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Trouble with module which wants to import and export
by J. Greg Davidson 24 Nov '01

24 Nov '01

I'm trying to port some Prolog code I wrote some time ago to Ciao and I'm having trouble figuring out the right way to use the Ciao module system. I have some path searching modules which have the following interface; % Requires: % successor( Given state, Successor state ). % Provides: % path( Given start state, Given goal state, Path from start to goal ). That is, they import successor/2 from the domain code (the client module) and provide path/3 back. I'm not figuring out how to write these mutually dependent modules. What am I missing? Thanks in advance, _Greg -- J. Greg Davidson jgd(a)well.com

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