[jboss-jira] [JBoss JIRA] (DROOLS-2361) Use of System.identityHashCode in org.drools.core.common.DefaultFactHandle

[Sidi Mohamed EL AATIFI (JIRA)]

     [ https://issues.jboss.org/browse/DROOLS-2361?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sidi Mohamed EL AATIFI updated DROOLS-2361:
-------------------------------------------
    Description: 
This is a JVM https://bugs.openjdk.java.net/browse/JDK-6378256 bug has been fixed in JDK 9 
It's not a bug in Drools but will be affected severely if using Drools for serious workloads.
in my case 40% of CPU usage was to
_java.lang.System.identityHashCode_ used by org.drools.core.common.DefaultFactHandle#determineIdentityHashCode

!before.png|thumbnail! 

UPDATE:
One possible solution is to introduce new (optional) interface for identityHashCode that can be implemented by user facts and internal facts. 
and provide identityHashCode backed by native (fast) hashCode  


  was:
This is a JVM https://bugs.openjdk.java.net/browse/JDK-6378256 bug has been fixed in JDK 9 
It's not a bug in Drools but will be affected severely if using Drools for serious workloads.
in my case 40% of CPU usage was to
_java.lang.System.identityHashCode_ used by org.drools.core.common.DefaultFactHandle#determineIdentityHashCode

UPDATE:
One possible solution is to introduce new (optional) interface for identityHashCode that can be implemented by user facts and internal facts. 
and provide identityHashCode backed by native (fast) hashCode 




> Use of System.identityHashCode in org.drools.core.common.DefaultFactHandle
> --------------------------------------------------------------------------
>
>                 Key: DROOLS-2361
>                 URL: https://issues.jboss.org/browse/DROOLS-2361
>             Project: Drools
>          Issue Type: Enhancement
>          Components: core engine
>    Affects Versions: 7.6.0.Final
>            Reporter: Sidi Mohamed EL AATIFI
>            Assignee: Mario Fusco
>              Labels: performance
>         Attachments: before.png
>
>
> This is a JVM https://bugs.openjdk.java.net/browse/JDK-6378256 bug has been fixed in JDK 9 
> It's not a bug in Drools but will be affected severely if using Drools for serious workloads.
> in my case 40% of CPU usage was to
> _java.lang.System.identityHashCode_ used by org.drools.core.common.DefaultFactHandle#determineIdentityHashCode
> !before.png|thumbnail! 
> UPDATE:
> One possible solution is to introduce new (optional) interface for identityHashCode that can be implemented by user facts and internal facts. 
> and provide identityHashCode backed by native (fast) hashCode  



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