Performance monitoring comes with a slight cost. Efforts
have been made to keep this cost to a minimum and the PMI service is
disabled as the default.
After the PMI service is enabled, you can adjust the level and scope of
monitoring. Make these adjustments using the Tivoli Performance Viewer, or
through the Administrative Console of the WebSphere Application Server.
The TradeScenario benchmark test was used for performance comparisons and
the overhead of PMI was measured. When the standard setting was used, the
overhead was 3.0%. Significant performance degradation was observed when
JVMPI counters were enabled.
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