[rules-users] Performance monitoring and hotspot detection in rules?

[Mark Proctor]

On 05/11/2010 20:52, H.C. wrote:
> I am trying to implement a performance monitor to find the most problematic
> rules in order to optimize performance. The main performance metrics I want
> to gather are:
>
> 1. How any times a rule's conditions have been evaluated
> 2. How long each rule's condition evaluation took
1 and 2 are hard because it's not that straight forward, it's not a 
single block. And the tree traversal approach to our current Rete impl 
means it interates from root to tip repeatedly, so you can't easily 
determine how long it spends in each node, you could probably add a 
counter but this would be custom code. We ar working on an new algorithm 
that is single pass, more like a pipeline, which will make ti easier to 
get statistics and timings.
> 3. How many times a rule's then clause actually executed
> 4. How long execution of a rule's then clause took
That you can do with the agenda listener. Also try looking at the audit 
log impl.
> Are there any existing or recommended approaches to do this? I have looked
> some at the AgendaEventListener methods but can't clearly map events to the
> above. Is there some other logging interface with more events?
>
> Thanks in advance.
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