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IBM’s Relative Performance (rPerf) metric is a great tool for comparing commercial workload performance between different Power System servers. It’s often. This post outlines a recent Nigel Griffiths tweet about estimating rperf for your LPAR. Read on to find out more. Articles on IBM AIX performance including server throughput, system performance and IBM AIX commands.

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These guidelines may help you achieve the performance that you expected. Read The Current Issue: Since Rper owns and controls the rPerf benchmark, it can report both rprrf and estimated data for Power servers.

How much of a reduction? So lets talk about things you should think about when using rPerf to make sizing or performance estimates. Simply stated, benchmarking refers to running a set of programs on various computer and network configurations and measuring the results.

Performance tuning is always an iterative process of removing one performance bottleneck in order to reveal the next performance bottleneck.

More Articles From Charlie Cler. X We use cookies to optimize your visit to our website. Management has ais specified the software architecture and is ready to start hardware procurement. Additionally, the actually real world performance of a given server might be affected over time by improvements or bugs in the firmware, AIX, or the application while the official rPerf is seldom changed in the Power Systems Performance Report after the initial release of the server model.

The savvy performance analyst knows that it’s neither feasible tperf this point in time nor cost-effective to set up actual performance testing of the new software. You have to be realistic and understand that you will need to be able to move up to later levels of software and firmware to take advantage of improvements.


rPerf Definition from PC Magazine Encyclopedia

Second, rPerf numbers are expressed in terms of throughput as opposed to speed. Numerous benchmark programs are in use today. Actual performance will vary, based on application and configuration details. AIX Live Update with Benchmarks are popular because they have measurable and repeatable performance objectives and workloads.

The rperf numbers are only available for certain number of CPUs. X We use cookies to optimize your visit to our website. In addition, most benchmark rules require that the full benchmark be run and fully documented for each published data point. The tuning setting from older machines and OS are unlikely to work perfectly. The most exciting POWER6 enhancement, live partition mobility, allows one to migrate a running LPAR to another physical box and is designed to move running partitions from one POWER6 processor-based server to another without any application downtime whatsoever.

Note that rPerf can only be used for making comparisons within Power servers. In this case, the script guesses the rPerf based on rPerf numbers in a fairly crude way. Latest AIX with Service Packs – like all benchmarks, the best operating system version is used to get those latest performance fixes and improvements. If you are some where between these options then you may have to make a series of changes, upgrades or updates to achieve good performance on your new machine.

Running industry benchmarks can be very expensive. Posted January 3, Permalink. You will have to apply your own rules for that. The pSeries is the baseline reference system and has a value of 1. For workload migrations and server consolidation projects, rPerf data is frequently used for CPU sizing.

How to Use rPerfs for Workload Migration and Server Consolidation

Many benchmarks exist for comparing servers, so why did IBM create the rPerf measurement? Check the Facts and Features document for the rPerf with smallest number of CPU cores for you machine, below that number you are making assumptions – particularly as you go below boundaries in the machine like a drawer or whole POWER7 chip and below one CPU core. If it says estimated then it is NOT an official number.


If you are breaking a lot of these assumptions then you may not get the performance you expected or hoped to achieve. But I hope this blog entry will help every one to either get it right first time or at least set realistic expectation and outline some prime areas that will need investigation to realise benefits, thanks Nigel.

He can be reached through www. He can be reached at ccler forsythe. If you would like to change your cookie settings at any time please view our privacy policy for additional information. Particularly, take and early opportunity to apply the first two updates after the initial release. X We use cookies to optimize your visit to our website.

There are many pitfalls in using benchmarks in computer sizing endeavors.

The rPerf Benchmark

There are similar assumptions when dealing with LPARs of smaller sizes than the official rPerf numbers. These are a simple calculation and will not be exact – i. How do I use the vio Some of the more notable benchmark suites are Standard Performance Evaluation Corp.

We use cookies to optimize your visit to our website. Recent AIX version are much better out of the box but the basics still need to be monitored and checked.