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.
>
> Thank you for clearing this up,
> Alan.
>
> PS I have successfully increased the VM's heap to 64m with no problems.
>
---------------------------------------------------------
Ernest Friedman-Hill
Distributed Systems Research Phone: (510) 294-2154
Sandia National Labs FAX: (510) 294-2234
Org. 8920, MS 9214 [EMAIL PROTECTED]
PO Box 969 http://herzberg.ca.sandia.gov
Livermore, CA 94550
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