RMF is an optional feature of z/OS
Resource Measurement Facility™ (RMF™) is shipped with every release of z/OS at the current level of support. It is integration tested with z/OS and includes the enhancements available with every new release. It's easier than ever to install RMF.

RMF—real value for the customer
RMF is designed to ease the management of single or multiple system workload and to enable faster reaction to system delays. Detecting a possible bottleneck early means that corrective actions can be taken earlier. System delays are avoided or at least remedied at an early stage.

System programmers are supported by several reports that ease their work, helping them to tune their system optimally. Consequently, this leads to fewer workload problems and, most important, increases system and operator productivity, a fact that makes the company as a whole more effective at less cost.

Read the RMF online specification sheet
RMF Performance Monitoring – Java Edition