WebSphere Performance Monitoring Infrastructure (PMI)

For the next weeks I’ll be posting some feedback about my experience on using WebSphere PMI tool. It is an incredible tool for performance tuning. Basically it frees you from plugging a CPU intensive profiler (that is also usually hard to setup) and lets you see (for example) performance data such as waiting and use time for connections inside a pool. Still there are cases when you need to see information in bits as it is available on a profiling tool such as Eclipse TPTP.

JCA posts have been updated, I have made some changes about ManagedConnections and Connection Handles interaction in the Foo Connector. For those who have read the previous version of the post I suggest re-reading it.

Still on the performance topic there is one phrase atributed to Donald Knuth that is worth mentioning:

“We should forget about small efficiencies, say about 97% of the time: premature optimization is the root of all evil.” (Knuth, Donald. Structured Programming with go to Statements, ACM Journal Computing Surveys, Vol 6, No. 4, Dec. 1974. p.268.) Wikipedia – Optimization

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