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drools-metric/README.md

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Drools Metric Analysis module

This module is developed to help drools metric/performance analysis.

Metric Logging

To enable metric logging,

  • Add this module to dependency
  • Set system property -Ddrools.metric.logger.enabled=true
  • Enable trace level logging for org.drools.metric.util.MetricLogUtils
<logger name="org.drools.metric.util.MetricLogUtils" level="trace"/>

When you run drools, you will see logging like this.

2020-06-16 14:26:21,596 [main] TRACE [JoinNode(6) - [ClassObjectType class=com.sample.Order]], evalCount:1000, elapsedMicro:5962
2020-06-16 14:26:21,693 [main] TRACE [JoinNode(7) - [ClassObjectType class=com.sample.Order]], evalCount:100000, elapsedMicro:95553
2020-06-16 14:26:23,866 [main] TRACE [ AccumulateNode(8) ], evalCount:4999500, elapsedMicro:2172836
2020-06-16 14:26:23,885 [main] TRACE [EvalConditionNode(9)]: cond=com.sample.Rule_Collect_expensive_orders_combination930932360Eval1Invoker@ee2a6922], evalCount:49500, elapsedMicro:18787
  • evalCount : The number of times that constrains are evaluated in the node
  • elapsedMicro : The elapsed time of the node execution (microsecond)

You can also use ReteDumper to match the node in problem so that you can locate the inefficient rule/condition.