Bytecode Instrumentation

| 2004 JavaOne

Conference | Session 3042 Copyright Hewlett Packard Co., 2004.

Test environment

•

Goal: Count method entries for method

consuming most time

• Class A1 has two methods: a1() and a2()

─ Collect amount of time spent in each

• Separate thread wakes up periodically

─ Switches preference for calling a1() or a2()

• Thread launched from Agent

─ Periodically wakes up

─ Accesses performance information

─ Instrument the method with the highest time