[jboss-jira] [JBoss JIRA] (DROOLS-775) Performance degradation with objects with many properties in working memory.

[Federico Bertola (JIRA)]

    [ https://issues.jboss.org/browse/DROOLS-775?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13063208#comment-13063208 ] 

Federico Bertola commented on DROOLS-775:
-----------------------------------------

Yes, if I use an object containing only the required properties the performance are rather comparable (the newer version, once the JIT kicks in, is even faster). If I use an object with the same few properties but scattered across 2 or 3 layer of hierarchy than the performance for the older drools won't change but the newer will suffer a bit.

> Performance degradation with objects with many properties in working memory.
> ----------------------------------------------------------------------------
>
>                 Key: DROOLS-775
>                 URL: https://issues.jboss.org/browse/DROOLS-775
>             Project: Drools
>          Issue Type: Bug
>          Components: core engine
>    Affects Versions: 6.0.0.Final, 6.1.0.Final, 6.2.0.Final, 6.3.0.Final
>         Environment: Ubuntu 14.10 x64, jdk 8
>            Reporter: Federico Bertola
>            Assignee: Mario Fusco
>              Labels: regression
>         Attachments: drools-test.zip
>
>
> I experience some major performance degradation while migrating from drools 5.0.1 to 6.x. I'm inserting objects with many properties into the working memory and firing some very basic rules which will match against a very small subset of those properties. I expected that the older version of Drools, which uses pure reflection, to be somewhat slower that the newer, which uses some clever ASM optimization., but this is not the case. I've also noticed that if the required properties are scattered across multiple level of hierarchy, the performance issue will aggravate.



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