[jboss-jira] [JBoss JIRA] (JBRULES-3459) Performance regression when using 'matches' operator, comparing with 5.3.

Tue May 1 05:04:19 EDT 2012

     [ https://issues.jboss.org/browse/JBRULES-3459?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mario Fusco resolved JBRULES-3459.
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    Fix Version/s: 5.4.0.Final
       Resolution: Done

This is not caused by a performance regression, but a difference in the semantic of the not matches operator. In particular the expression:

null not matches "any value"

is always evaluated false in 5.3 and true in 5.4. The behavior implemented in the 5.4 is more semantically correct, but of course, in the provided test case, implies that far more constraints need to be evaluated causing in turn the apparent performance regression.

> Performance regression when using 'matches' operator, comparing with 5.3.
> -------------------------------------------------------------------------
>
>                 Key: JBRULES-3459
>                 URL: https://issues.jboss.org/browse/JBRULES-3459
>             Project: Drools
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>          Components: drools-core  (expert)
>    Affects Versions: 5.4.0.CR1
>            Reporter: Petr Široký
>            Assignee: Mario Fusco
>              Labels: regression
>             Fix For: 5.4.0.Final
>
>         Attachments: expert-matches-perf-test.zip
>
>
> I am seeing performance regression when using rules with 'matches' and 'not matches' (comparing 5.4.0.CR1 and 5.3.0.Final). In my case the difference is up to 100 % (2000 ms vs 4000 ms). The DRL file contains 100 rules and in the test 500000 non-matching facts are inserted into knowledge session. See the attached standalone maven project.

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