Sun GlassFish Enterprise Manager Performance Monitor 1.0 Release Notes

Using the Profiler adversely affects server performance (6802071)

Using the Profiler (available on local GlassFish domains and JVMs) adversely affects performance of the profiled application. When profiling is started, the profiled application is suspended while profiling instrumentation is enabled, and when profiling is stopped, the profiled application is again suspended while profiling instrumentation is disabled. While profiling is active, performance of the profiled application is reduced.

Workaround: None. Using the Profiler is not advised on production servers. For preproduction and development systems, here are some tips: