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ODM Series 1: IBM ODM Best Practices – The Performance

1. The Performance Cost

The performance cost for a Decision Service may look something like:

PerCost

 

 

 

 

 

 

 

 

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2. The eXecutable Object Model and the RuleFlow

XOM type choices:

  • JAVA XOM better performance
  • XML XOM
    • Dynamicity
    • Useful in case of XML model

Ruleflow:

  • Limit the size and the complexity of the ruleflow, it is interpreted.
  • Always use the same engine algorithm to save memory.

3. The Engine Algorithm

Choose the correct engine algorithm depending on your Decision Service.

RetePlus (The default mode)

  • Stateful application
  • Rule chaining application
  • May be useful in the case of many objects

Sequential

  • Application with many rules and few objects
  • Most of the customer cases.
  • Really efficient in multi-thread environment.

Fastpath

  • Application with rules implementing a decision structure and many objects.
  • May have longer compilation but faster at run time.
  • Really efficient in multi-thread environment.

4. Decision Server Rules Tuning

  • The log level in the Rule Execution Server should be set to level Severe or Warning in the production environment to increase performance.
    • This property (TraceLevel) is accessible in the resource adaptor of the Rule Execution Server or in the ra.xml.
  • Tune the GC and memory size.
    • Starting configuration 64bits
    • -Xgcpolicy:gencon –Xmn2048M –Xmx4096M –Xms4096M
  • Tune the RES pool size.
    • A sizing methodology is available at: http://www-01.ibm.com/support/docview.wss?uid=swg21400803

5. Impact of the Execution Trace

Trace

 

6. Impact of the XOM Type

XOMType

 

7. Remote Web Service call vs. Local call

WSvsLocal

8. Fastpath Algorithm vs. Sequential Algorithm

FaspathvsSequential

 

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Soufiane Elhorma

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