Re: JESS: unexpected increase in number of activations

Wed, 30 Jan 2008 13:36:54 -0800

7.1a3 is an alpha version, and there were plenty of bugfixes for the two following beta releases; can you see if this goes away in 7.1b2? 

On Jan 30, 2008, at 2:31 PM, Michael Atighetchi wrote:


Hi,


we are using Jess version Jess71a3 and started seeing some strange  
behavior.


Consider the following jess code:


(deftemplate timevalue
             "fact holding current time"
             (slot t (default 0.0)))


(deftemplate setTimeReq
             "sets time to new value"
             (slot t))

(defrule set-time
         "set time"
    ?r <- (setTimeReq (t ?newVal))
    ?tv <- (timevalue (t ?curT))
       =>
   (retract ?r)
   (modify ?tv (t ?newVal))
)


(deffacts generalFacts
    "Facts used in this protocol module"
    (timevalue (t 0)))




The strange behavior is that we see a small (but consistent)  
increase in the number of

activations when asserting setTimeReqs.

Initially, a setTimeReq only causes one activation:


3945 [JessRunner] INFO srs.csism.jessSim.Log4jRouter  - -- 
JessSim--   ==> f-2759 (PFACT::setTimeReq (t 0.0))
3945 [JessRunner] INFO srs.csism.integration.CsismJessEventHandler   
- Fact has been added with name=PFACT::setTimeReq
3945 [JessRunner] INFO srs.csism.integration.CsismJessEventHandler   
- Lookin at name=PFACT::setTimeReq
3945 [JessRunner] INFO srs.csism.jessSim.Log4jRouter  - -- 
JessSim--  ==> Activation: PFACT::set-time :  f-2759, f-2643
3945 [JessRunner] INFO srs.csism.jessSim.Log4jRouter  - -- 
JessSim--  FIRE 1 PFACT::set-time f-2759, f-2643



Then, two activations happen:

4237 [JessRunner] INFO srs.csism.jessSim.Log4jRouter  - -- 
JessSim--   ==> f-2769 (PFACT::setTimeReq (t 3.0))
4237 [JessRunner] INFO srs.csism.integration.CsismJessEventHandler   
- Fact has been added with name=PFACT::setTimeReq
4237 [JessRunner] INFO srs.csism.integration.CsismJessEventHandler   
- Lookin at name=PFACT::setTimeReq
4237 [JessRunner] INFO srs.csism.jessSim.Log4jRouter  - -- 
JessSim--  ==> Activation: PFACT::set-time :  f-2769, f-3552
4237 [JessRunner] INFO srs.csism.jessSim.Log4jRouter  - -- 
JessSim--  ==> Activation: PFACT::set-time :  f-2769, f-3552
4237 [JessRunner] INFO srs.csism.jessSim.Log4jRouter  - -- 
JessSim--  FIRE 1 PFACT::set-time f-2769, f-3552



Then, three:


4353 [JessRunner] INFO srs.csism.jessSim.Log4jRouter  - -- 
JessSim--   ==> f-2770 (PFACT::setTimeReq (t 4.0))
4353 [JessRunner] INFO srs.csism.integration.CsismJessEventHandler   
- Fact has been added with name=PFACT::setTimeReq
4353 [JessRunner] INFO srs.csism.integration.CsismJessEventHandler   
- Lookin at name=PFACT::setTimeReq
4353 [JessRunner] INFO srs.csism.jessSim.Log4jRouter  - -- 
JessSim--  ==> Activation: PFACT::set-time :  f-2770, f-3554
4353 [JessRunner] INFO srs.csism.jessSim.Log4jRouter  - -- 
JessSim--  ==> Activation: PFACT::set-time :  f-2770, f-3554
4353 [JessRunner] INFO srs.csism.jessSim.Log4jRouter  - -- 
JessSim--  ==> Activation: PFACT::set-time :  f-2770, f-3554
4353 [JessRunner] INFO srs.csism.jessSim.Log4jRouter  - -- 
JessSim--  FIRE 1 PFACT::set-time f-2770, f-3554
4353 [JessRunner] INFO srs.csism.jessSim.Log4jRouter  - -- 
JessSim--   <== f-2770 (PFACT::setTimeReq (t 4.0))



Then back to three:


4455 [JessRunner] INFO srs.csism.jessSim.Log4jRouter  - -- 
JessSim--   ==> f-2775 (PFACT::setTimeReq (t 5.0))
4455 [JessRunner] INFO srs.csism.integration.CsismJessEventHandler   
- Fact has been added with name=PFACT::setTimeReq
4455 [JessRunner] INFO srs.csism.integration.CsismJessEventHandler   
- Lookin at name=PFACT::setTimeReq
4455 [JessRunner] INFO srs.csism.jessSim.Log4jRouter  - -- 
JessSim--  ==> Activation: PFACT::set-time :  f-2775, f-3555
4455 [JessRunner] INFO srs.csism.jessSim.Log4jRouter  - -- 
JessSim--  ==> Activation: PFACT::set-time :  f-2775, f-3555
4455 [JessRunner] INFO srs.csism.jessSim.Log4jRouter  - -- 
JessSim--  ==> Activation: PFACT::set-time :  f-2775, f-3555
4456 [JessRunner] INFO srs.csism.jessSim.Log4jRouter  - -- 
JessSim--  FIRE 1 PFACT::set-time f-2775, f-3555
4456 [JessRunner] INFO srs.csism.jessSim.Log4jRouter  - -- 
JessSim--   <== f-2775 (PFACT::setTimeReq (t 5.0))



How can this be explained ?

Michael


--
Michael Atighetchi  [EMAIL PROTECTED]  BBN Technologies

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