I think Nanlin Xiao wrote:
>
> Hello:
>
> I have been using jess 3.0 and recently upgraded to jess 4.1.
>
> Two things we noticed:
>
> 1. Loading rule is slower (Sorry no quantified numbers)
> 2. Use a lot more memory
These two are true. The whole idea behind the Rete algorithm is to
1) spend as much time in the compiling phase as possible, to minimize
runtime; and 2) trade space for speed, storing things instead of
recomputing them whenever possible to increase performance. Jess does
more of both of these in 4.x compared to 3.x.
> 3. Performance is noticable worse than 3.x
This is definitely -un-true. In fact, 4.x performance is as much as
several orders of magnitude -better- than 3.x, given enough memory. If
the machine has very little RAM, however (and these days, less than 32
MB is 'very little') you might be having problems whereby
disk-thrashing or garbage collection are dominating your runtime.
>
> Are these expected in jess 4.1 or I have done something wrong?
>
If you can come up with a specific -small- example of something that
is noticeably slower in 4.x than in 3.x, I'd be interested to see it.
> Thank you for a answer.
>
> Good job!
Good job on... what? :)
>
> Nanlin Xiao
> CyberObject.
---------------------------------------------------------
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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