I am reminded occasionally when debugging production issues that setting the PMI level in WebSphere Application Server to "all" is not a good thing to do. At the "all" setting one can see an application exhibit negative behavior. I am also learning no two applications will always exhibit the same problem. Some applications crash and burn under the weight of PMI=all incapable of providing a response to any request. Other applications seem to continue to function nominally but the CPU for those processes seem to be considerably higher.
Finally, regardless of the PMI settings configured in the production environment it is imperative that all members of a cluster are set to the same values. Having some processes set to one level and other processes set to another results in higher CPU utilization from some JVMs and not others.