Hello-
On Mon, 10 Jul 2000, friedman_hill ernest j wrote:
>
> Note that compilation of Java code is one option, but building strings
> of bytecode from some internal representation is another, and this
> latter is something I want to experiment with. Also look at the
> jess.Accelerator interface and how it is used: I've got an
> implementation (never released) which can speed up wordgame and zebra,
> both math-intensive problems, by about a factor of two by turning all
> the nested LISP math into Java code.
The Accelerator and Test interfaces are geared toward optimizing LHS
evaluation in the Rete network. I suppose I'm more concerned about RHS
performance, and the ease of developing fast procedural exoskeletons upon
rulebases.
For example, writing a few loops iterating over multislots and performing
other list manipulations can really bog things down when written in Jess.
While a byte compiler could improve things dramatically, I would think the
best performance enhancements would come from creating compiled static
methods for long-lived deffunctions and lisp blocks on the RHS.
Userfunctions are an adequate solution in the meantime, but I think there
is plenty of room for improvement, especially in terms of ease of
development. I would much enjoy writing everything as Jess scripts. It
should also be noted that HotSpot and JITs will not be able to optimize a
byte compiler nearly as well as the individual code blocks when separately
compiled. This was my primary point against adding a byte compiler, since
Java is already byte compiled!
Perhaps once a byte compiler is written it will be a natural step to
include HotSpot-like features within Jess? I'm intrigued by the notion of
using one Rete engine to tweak how another is performing. With
multiprocessing becoming more available, Rete has quite some potential
ahead of it! Okay, I'm starting to daydream . . . .
-Dave Barnett
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