[rules-users] Performance consideration in rule writing

[Zhuo Li]

Hi, team,

 

I have some quick questions here regarding performance best practices of
rule writing. See below two pieces of rules:

 

Rule 1

 Salience 100

 No-loop true

 When $txn : data(sourceid ==
5txnjustify==995eval(creditOption($txn)==1)eval(isGCSwitch($txn))i
sCurrencyEquals($txn)==0compareToPostThreshold($txn)==2);

 Then

   .

 End

 

Rule 2

 Salience 100

 No-loop true

 When $txn : data(sourceid ==
5txnjustify==995eval(creditOption($txn)==1)eval(isGCSwitch($txn))i
sCurrencyEquals($txn)==0compareToPostThreshold($txn)==1);

 Then

  .

 End

 

Questions:

1.   Will I gain better performance if I put the rule differentiator
condition compareToPostThreshold($txn)==2 at the beginning of both rule 1
and 2? 

2.   I saw salaboy's video claiming that to avoid using eval() in the
rule. Do we have any alternative way to do that from a performance
consideration or I'd better collect/ prepare all the data before I send them
into the session?

3.   What's you guys' naming convention for rule's salience?

 

PS: my Drools version is 5.2.0.

 

Best regards

Abe

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Re: [rules-users] Performance consideration in rule writing

[Wolfgang Laun]

See below.

2011/12/26 Zhuo Li milanello1...@gmail.com

  Hi, team,

 ** **

 I have some quick questions here regarding performance best practices of
 rule writing. See below two pieces of rules:

 ** **

 Rule “1”

  Salience 100

  No-loop true

  When $txn : data(sourceid ==
 5txnjustify==”995”eval(creditOption($txn)==1)eval(isGCSwitch($txn))isCurrencyEquals($txn)==0compareToPostThreshold($txn)==2);
 

  Then

…

  End

 ** **

 Rule “2”

  Salience 100

  No-loop true

  When $txn : data(sourceid ==
 5txnjustify==”995”eval(creditOption($txn)==1)eval(isGCSwitch($txn))isCurrencyEquals($txn)==0compareToPostThreshold($txn)==1);
 

  Then

   …

  End

 ** **

 Questions:

 **1.   **Will I gain better performance if I put the rule
 differentiator condition “compareToPostThreshold($txn)==2” at the beginning
 of both rule 1 and 2?

One kind pf Rete optimization is based on evaluating common constraints
once, therefore: no.


 

 **2.   **I saw salaboy’s video claiming that to avoid using eval() in
 the rule. Do we have any alternative way to do that from a performance
 consideration

Constraints based on fields using == are best. Other things may result in
eval-like evaluations anyway. Most of the time, it isn't eval that causes
performance setbacks.

or I’d better collect/ prepare all the data before I send them into the
 session?

Not clear what you mean by this, but if you can provide attributes that
lend themselves to straightforward constraints it might be worthwhile
considering some up-front processing of facts.


 

 **3.   **What’s you guys’ naming convention for rule’s salience?

Not clear what you mean by that.

-W


 

 ** **

 PS: my Drools version is 5.2.0.

 ** **

 Best regards

 Abe

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 rules-users@lists.jboss.org
 https://lists.jboss.org/mailman/listinfo/rules-users


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