you can use the match function to see the matches the other option is to calculate the average cost of the RETE network to get an estimated cost.
peter On Wed, Sep 30, 2009 at 11:21 AM, jo <etaoi...@yahoo.com> wrote: > > > Is there a way to coax some statistics out of jess to see the impact of > asserted facts/rules ? or a kind of dump of the built network... > > Tx > J > > > > ----- Original Message ---- > From: Ernest Friedman-Hill <ejfr...@sandia.gov> > To: jess-users <jess-users@sandia.gov> > Sent: Wednesday, September 30, 2009 4:42:46 PM > Subject: Re: JESS: assertion - exception out of memory > > Pattern-matching happens while facts are being asserted, not while rules are > firing, in the same way that the index of a database is built when the data > is inserted, not while a query is running. That's the essence of the Rete > algorithm used by Jess. Read the chapter on "How Jess Works" in the manual to > learn more. > > > > On Sep 30, 2009, at 7:54 AM, Lucia Masola wrote: > >> thank you very much for your answer! I´m gonna make the changes that you >> mention. I do not have the program right here, and i came up with another >> issue regarding this problem. I encountered the out of memory exception when >> I asserted the facts, not when i want to run the rules. Do you think that >> this will solve the problem too?, or do i have to make another changes?. I >> was surprise that I couldn´t assert the facts, i thought that the rules >> didn´t matter at all until you tried to run them. >> >> On Wed, Sep 30, 2009 at 1:18 AM, Friedman-Hill, Ernest >> <ejfr...@sandia.gov>wrote: >> >>> Hi, >>> >>> I don't know why your code isn't in the message that went out to the >>> mailing list, but I saw it when I approved the message for the list. >>> Basically you're seeing exactly the issue discussed in the FAQ here: >>> >>> http://www.jessrules.com/jess/FAQ.shtml#Q12 >>> >>> You've got a couple of rules with patterns like >>> >>> (Method ?m1) >>> (Method ?m2) >>> (Call (something ?m1) (something-else ?m2)) >>> (some-other-test ?m1 ?m2) >>> >>> These patterns first construct partial matches for all pairs of Method >>> facts -- i.e., n^2 pairs, so this uses memory proportional to the square of >>> the number of facts. If you just rearrange it like >>> >>> (Call (something ?m1) (something-else ?m2)) >>> (Method ?m1) >>> (Method ?m2) >>> (some-other-test ?m1 ?m2) >>> >>> then only the relevant pairs will be formed -- presumably a much smaller >>> number. And if you can do something like >>> >>> (Call (something ?m1) (something-else ?m2)) >>> (some-other-test ?m1 ?m2) >>> (Method ?m1) >>> (Method ?m2) >>> >>> then the memory usage will be smaller still. >>> >>> >>>> -----Original Message----- >>>> From: owner-jess-us...@sandia.gov >>>> [mailto:owner-jess-us...@sandia.gov] On Behalf Of Lucia Masola >>>> Sent: Tuesday, September 29, 2009 10:59 PM >>>> To: jess-users >>>> Subject: JESS: assertion - exception out of memory >>>> >>>> Hi, I'm working in a java applications that has Jess >>>> embedded. I had some >>>> trouble in the assertions of facts. I'm asserting the facts >>>> from java and i >>>> received the exception "out of memory". I realized that the >>>> problem is in >>>> the archive clp because when i tried to do the same assertion >>>> with another >>>> clp i didn't encounter the problem. I also tried to take out >>>> some rules from >>>> the clp in order to check which rule were having the problem >>>> and i found >>>> them, but i don't know how to solve it (the trouble rules are >>>> callerMethods, >>>> calleeMethods ). if anyone can help me with this issue i will >>>> appreciate it >>> >>> -------------------------------------------------------------------- >>> To unsubscribe, send the words 'unsubscribe jess-users y...@address.com' >>> in the BODY of a message to majord...@sandia.gov, NOT to the list >>> (use your own address!) List problems? Notify owner-jess-us...@sandia.gov > > --------------------------------------------------------- > Ernest Friedman-Hill > Informatics & Decision Sciences, Sandia National Laboratories > PO Box 969, MS 9012, Livermore, CA 94550 > http://www.jessrules.com > > > > > > > > -------------------------------------------------------------------- > To unsubscribe, send the words 'unsubscribe jess-users y...@address.com' > in the BODY of a message to majord...@sandia.gov, NOT to the list > (use your own address!) List problems? Notify owner-jess-us...@sandia.gov -------------------------------------------------------------------- To unsubscribe, send the words 'unsubscribe jess-users y...@address.com' in the BODY of a message to majord...@sandia.gov, NOT to the list (use your own address!) List problems? Notify owner-jess-us...@sandia.gov. --------------------------------------------------------------------
