The best thing to do would be to try to figure out where the memory is
going, and whether it's a bug, or a normal consequence of how you're
operating. There's no reason why, given what you've described, memory
usage should increase over time, so there's either something you're
not telling me, or there's a bug someplace. Can you try to check it
out using any kind of a heap profiler?
On Feb 17, 2010, at 10:43 PM, Sam Sarjant wrote:
Hi. I am using JESS to represent a relational environment for an
agent to
interact in (Blocks World, to be specific, if that helps).
At each state, I am first resetting the Rete object and then
asserting the
state of the environment. From these assertions, further assertions
are made
by using rules which define extra predicates. For example, if I
assert (on a
b), I also create the (above a b) and possibly (clear a), depending
on the
exact state of the environment when (run) is called.
Anyway, the agent receives this information, chooses an action to
take, and
the environment is updated again by resetting and re-asserting.
While I could contain all operations within JESS in this particular
environment, some Java code is required to be run during the process
for
other environments, so this is why I don't simply operate using
assert and
retract.
Obviously this doesn't fit the idea that generally rule bases remain
static,
but the performance I get is reasonable. My problem lies in the fact
that
after several hundred (or perhaps thousand) of these assertion,
resetting
loops, Java or JESS runs out of memory and throws an
OutOfMemoryException.
The rules for defining extra predicates are asserted only once, but
queries
are asserted roughly each iteration for state matching, though they
should
be asserting over one-another (defqueries of the same name).
Is there something I can do to 'flush' JESS, or stop it storing
these reset
assertions? Or would it be better to periodically create a new Rete
object,
load in the rules and continue?
- Sam Sarjant
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Ernest Friedman-Hill
Informatics & Decision Sciences, Sandia National Laboratories
PO Box 969, MS 9012, Livermore, CA 94550
http://www.jessrules.com
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