Workloads have shifted over the last eight years and IBM is committed to providing clients with a relative system performance metric that reflects those changes. IBM publishes the rPerf measurement of relative performance metric for the IBM Power™ Systems family of UNIX® servers. This metric replaced ROLTP which was withdrawn. rPerf is a combination of several different measures of total systems commercial performance that takes into account the demands on a server in today's environment. Although you might find historical references to ROLTP on this Web site, it will no longer be published for any currently marketed or new Power Systems.

rPerf (Relative Performance) — An estimate of commercial processing performance relative to other IBM UNIX systems. It is derived from an IBM analytical model which uses characteristics from IBM internal workloads, TPC and SPEC benchmarks. The rPerf model is not intended to represent any specific public benchmark results and should not be reasonably used in that way. The model simulates some of the system operations such as CPU, cache and memory. However, the model does not simulate disk or network I/O operations.

rPerf estimates are calculated based on systems with the latest levels of AIX® and other pertinent software at the time of system announcement. Actual performance will vary based on application and configuration details. The IBM eServer™ pSeries® 640 is the baseline reference system and has a value of 1.0. Although rPerf may be used to compare estimated IBM UNIX commercial processing performance, actual system performance may vary and is dependent upon many factors including system hardware configuration and software design and configuration. Note that the rPerf methodology used for the POWER6™ processor-based systems is identical to that used for the POWER5™ processor-based systems. Variations in incremental system performance may be observed in commercial workloads due to changes in the underlying system architecture.

All performance estimates are provided "AS IS" and no warranties or guarantees are expressed or implied by IBM. Buyers should consult other sources of information, including system benchmarks, and application sizing guides to evaluate the performance of a system they are considering buying. For additional information about rPerf, contact your local IBM office or IBM authorized reseller.

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