[rules-users] How many objects we can assert into workingmemorymaximum

[Reddy Ramesh-in2259c]

Hi...,
 
Can any one pls help me.... regarding my previous mail...


________________________________

From: rules-users-bounces at lists.jboss.org
[mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Reddy
Ramesh-in2259c
Sent: Wednesday, February 28, 2007 12:49 PM
To: Rules Users List
Subject: RE: [rules-users] How many objects we can assert into
workingmemorymaximum


Hi all,
 
I have a rule something like this....,
 
 
 
package com.motorola.nmatg.nms.nfm.suppression
 
import com.motorola.nmatg.nms.nfm.suppression.ExtendedEvent;

/*
This rule compress duplicates
*/
rule "Compress"
 salience 10
 when
  event_1 : ExtendedEvent ( moid1 : source , severity1 : severity ,
eventType1 : eventType , eventTime1 : time )
  event_2 : ExtendedEvent ( moid2 : source , severity2 : severity ,
eventType2 : eventType , eventTime2 : time )
 
    
  eval (
            moid1.equals(moid2) &&
            severity1.intValue() == severity2.intValue() &&
            eventType1.equals(eventType2) &&
            eventTime2.longValue() >= eventTime1.longValue()
         )
  
 then
 
      event_1.setStatus("compress");
      event_2.setStatus("compress");

end
 
 
 
This is the rule which i am using in my DRL file. I am asserting events
into working memory such that all the events are matching with the rule.
But i am unable to assert more than around 1000 events into
workingMemory, I am keep asserting events into working memory, by the
time it reaches the count to around 1000 events, it is throwing memory
out of bound exception. I increased heap size from default 64mb to
512mb. with this i could able to assert more 300 events thats it. 
 
when i got this problem, i modified my rule in the following way,
 
 
rule "Compress"
 salience 10
 when
  event_1 : ExtendedEvent ( moid1 : source , severity1 : severity ,
eventType1 : eventType , eventTime1 : time )
  event_2 : ExtendedEvent ( source == moid1 , severity == severity1 ,
eventType == eventType1 , time >= eventTime1 ) 
    
 then
 
      event_1.setStatus("compress");
      event_2.setStatus("compress");

end
 
 
If i write my rule like this, then i could able to assert more 500 event
objects. i.e i could able to assert in total around 1700 event objects
with this modified rule. 
 
As per my understanding,
 
        when we assert objects into working memory, pattern matching is
done at the time of assertion only, while this process, if we create
more variables in "when" part and using "eval" creating more
overhead(memory perspective) while pattern matching. When we assert
thousands of objects(events) into working memory, i think Drools engine
creates several objects internally(in rete network which i am not
aware), i think that would be the overhead.
 
But in my project, i need to work with around 15,000 event objects in
the working memory, of them, around 10,000 objects will match the rule. 
 
 
Can any one in the group help me how to approach to solve this problem.
Is there anyway.. Ultimately, i have to work with 10000 events in
working memory, given all the events matches with the rule in DRL.
 
 
 
Thanks,
Ramesh


________________________________

From: rules-users-bounces at lists.jboss.org
[mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Michael Neale
Sent: Tuesday, February 27, 2007 12:52 PM
To: Rules Users List
Subject: Re: [rules-users] How many objects we can assert into working
memorymaximum


The answer is:

42. 

Or, perhaps, the length of a piece of string. 

It really varies with how much memory you want to throw at it, thats all
really. The effectiveness of the RETE network may also add some
overhead. 

I have heard of people pushing in millions of facts into one working
memory, but that would tend to be extreme - and it will use a lot of
memory. 

IN 3.2 there are some added efficiencies over 3.0, when it comes out. 


On 2/27/07, Reddy Ramesh-in2259c <in2259c at motorola.com> wrote: 

	Hi,
	 
	       Is working memory size increases dynamically?? How many
objects we can assert into workingmemory? given, all the objects are
matching with rule in a drl file...
	 
	can anyone please tell me this...?
	 
	thanks,
	Ramesh


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