[rules-users] Performance of compiler

[Christian Nedregård]

Thank you for the quick reply and the tip Ingomar.

Since our rules are template based I was able to merge them into 30 drls
(850 before). This gave a 30% perfomance improvement, but we are still not
able to compile more than 2 rules per second. I also tried to execute in
with jdk 1.6.0_03 instead of 1.4.2_11. This only gave a small performance
increase.

We are also seing the same slow performance in our production environment
wich is JDK 1.4.2_11 on Solaris, so this is not a OS spesific problem.

I addition I tried to run the compilation in a dedicated process with 1G
available memory with no performance increase, so it is not related to
memory restrictions either.

>From our experimentation I see that the compile time, unsurpisingly, is
directly connectet to the complexity of the rule. If i strip away he LHS and
RHS of the rules and only keep the imports and global definitions I am able
to get a compilation throughput at 24 rules per second.

Are your rules much simpler than ours? Can you think of any other reason why
you are seeing a much better compiler throughput?

Regards
Chr


On Fri, Apr 17, 2009 at 10:34 AM, Ingomar Otter <iotter at mac.com> wrote:

> Christian,
> with our app, we see a compile performance which is at least an order of
> magnitude higher.
> I would assume that in your case the extreme fine granularity of your DRLs
> may be slowing things down.
> Have you tried to consolidate these in bigger but fewer DRls?
>
> If you need that granualarity, you still have the option of joining these
> together before running it with the help of perl and the likes.
>
> --I
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