[jboss-jira] [JBoss JIRA] Commented: (BPEL-311) Performance improvement: Find a way to reduce number of org.jbpm.bpel.graph.def.CompositeActivity.findVariable() calls

[Aleksander Adamowski (JIRA)]

    [ https://jira.jboss.org/jira/browse/BPEL-311?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12491322#action_12491322 ] 

Aleksander Adamowski commented on BPEL-311:
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I've began tracking all of my changeset using GIT on GitHub, since they start to be hard to manage without a SCM.

The project on GitHub is:
http://github.com/aadamowski/jbpm-bpel

The general performance fixes are on the perf-general branch:
http://github.com/aadamowski/jbpm-bpel/tree/perf-general

This particular patch is commit 81c415e970fc6e823bb9a3977adf04455c5a3a77:
http://github.com/aadamowski/jbpm-bpel/commit/81c415e970fc6e823bb9a3977adf04455c5a3a77

> Performance improvement: Find a way to reduce number of org.jbpm.bpel.graph.def.CompositeActivity.findVariable() calls
> ----------------------------------------------------------------------------------------------------------------------
>
>                 Key: BPEL-311
>                 URL: https://jira.jboss.org/jira/browse/BPEL-311
>             Project: jBPM BPEL
>          Issue Type: Task
>      Security Level: Public(Everyone can see) 
>          Components: Engine
>    Affects Versions: jBPM BPEL 1.1.1
>            Reporter: Aleksander Adamowski
>            Assignee: Alejandro Guizar
>         Attachments: jbpm-bpel-CompositeActivity-variableDefinitionCache_HashMap.patch, org.jbpm.bpel.graph.def.CompositeActivity.findVariable.Call_graph.single_operation-expanded.png
>
>
> According to our profiling data, during a single invocation of a relatively simple business process (cannot post it here for confidentiality reasons), jBPM-BPEL performs an unreasonable number of findVariable() calls.
> Using JProfiler, we've recorded almost 150000 findVariable() calls for a single process execution (the process definition contains only 31 bpws:variable elements collectively).
> I suspect that there's some algorithm which runs in exponential time with respect to the number of variables or activities. Maybe adding some form of variable caching could enable dramatic performance improvements?

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