[rules-users] Measuring Drools Memory Usage

[Ingomar Otter]

We used two approaches to double check results.
At first we used an approach similiar to what you haved described.  
Please note that (depneding on platfom) freeMemory is not byte-  
exact). Wo you won't see little changes.
Also, if you were using stateless sessions the result you have seen  
may be correct.

Out other approach was to seriazie that parts we're instrested in (and  
assume that real memory usage is just an small factor to be applied to  
the result we go.
We then compared the two results and they agreed on the order of  
magnitude which was what were looking for.
However we were primarily looking at Rulebase sizes, not WM memory  
consumption - which for the application we are currently are working  
on is neglegctible.

 >Has anyone attempted to measure the incremental memory usage of using
 >Drools
Do you expect an incremental memory usage (aka memory leak) using  
Drools? I don't  ;-)
You may want to run your use-case let's say 100.000 times to easiert  
to measure results.

--I





Am 29.07.2008 um 03:11 schrieb Roger Tanuatmadja:

> Hi,
>
> Has anyone attempted to measure the incremental memory usage of using
> Drools? Anyone cares to share their methodology?
>
> I am currently following the following methodology:
> 1. Prevent garbage collection from happening by using large Xms Xmx  
> (1024m
> in my case), a NewRatio of 2 (I am sure other sizes will work as  
> well) and
> verbogegc enabled to confirm that no garbage collection is happening.
> 2. Use Runtime.freeMemory before and after fireAllRules and  
> measuring the
> difference.
>
> The problem with my methods so far has been that after a positive  
> memory
> usage (indicating you are using memory), subsequent use case (the  
> same one)
> incurs zero memory usage which is very strange.
>
> So I guess my question is 2 fold: anyone care to share their  
> methodology,
> and can anyone see what's wrong with mine?
>
> Thanks,
>
> Roger
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