[rules-users] Knowledge Base and Multiple Sessions

[gboro54]

I did run the test and your assessment is accurate. Sessions using different
knowledge bases to not perform any better. For the most part each thread is
running a separate "rule box", however there is one set of rules which all
messages must go through (millions) while the others will have a very small
subset sent to them based on what the first set determined...


Vincent Legendre wrote
> 
> I would say no.
> I think that every session has its own RETE nodes filled with its own
> facts. 
> May be the different RETE instances share some evaluators (or at least
> generated dynamic classes that represent nodes) so it could use a bit less
> memory than recreating the same kbase again and again (which can affect
> PermGenSpace on some jvm where GC is not good at purging the permgen).
> But the real perf hit should be due to using multiple Thread in a single
> jvm : if you add too much threads, gc, swap and so on can become long.
> 
> To test that may be you can test with using the same kbase for all
> session, and test the same with creating a new kbase for each session, and
> then compare the perfs (ignoring objects creation of course) ...
> ... and post the results back here :)
> 
> My own experience of usage of multi-thread with rules is for chaining
> multiple "rule box" having distinct kbase, so I never tried that.
> 
> 
> ----- Mail original -----
> De: "gboro54" <gboro54@>
> À: rules-users at .jboss
> Envoyé: Jeudi 10 Mai 2012 19:12:28
> Objet: [rules-users] Knowledge Base and Multiple Sessions
> 
> If you have multiple sessions running on different threads against the
> same
> knowledge base, is there any performance hit during evaluation? 
> 
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