Sorry for harping on the problem for which you have given
two answers, but...
Ernest Friedman-Hill wrote:
> I think Alan Barton wrote:
> >
> > Thank you for your response.
> >
> > I now have 2 questions for you :)
> > 1) Is there a conference for JESS users or a regular/annual gathering?
>
> We've never had one, but there has been a semi-once-in-a-while CLIPS
> conference. Would anyone on the list travel to either Livermore,
> California (near SF) or Washington, DC if we held such a conference
> for Jess users?
>
> > 2) What exactly does a retract do?
> >
> > I have performed some tests with the following results...
> >
> > Rule for Test 1: Match all facts in the fact list then print the fact.
> > Rule for Test 2: Match all facts in the fact list then print the fact and retract
>the fact.
> >
> > For test 1: I would expect (if I have 16m of RAM and 10,000 facts are
> > asserted) that I would run out of memory... as you stated...
> > For test 2: I would expect (if I have 16m of RAM and 10,000 facts are
> > asserted) that I would NOT run out of memory because I am
> > under the impression that the fact is completely deleted from the
> > Rete network and hence should require no more memory.
>
> It is, but it's not deleted until the (retract) is called, and it
> won't be called until RHS processing starts (i.e., until (run) is
> called. ) All the memory-intensive stuff happens during calls to
> (assert) and/or (reset) and/or (modify). If you assert the 10,000
> facts, the damage (as demonstrated in the math I did last time) is
> done - you run out of memory before (run) is ever called.
Ok, here is a more detailed version of what I have been trying to say...
For each of 10,000 items
begin
convert the item to a jess fact
assert the fact
call run
end
And in my rule I:
match the fact to get the fact id
then I:
retract the fact.
end
So as I see it, the RHS processing should be performed everytime I call run.
Which happens everytime I assert each of the 10,000 facts. Therefore,
I should never run out of memory... but alas, I still do!
Thank you again for your reply,
Alan.
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