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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Rerf has already specified the software architecture and is ready to start hardware procurement. The savvy performance analyst knows that it’s neither feasible at this point in time nor cost-effective to set up actual performance testing of the new software. Posted January 3, Permalink. Charlie Cler supports customers in a solutions-architect role at Forsythe Technology Inc.

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The official rPerf numbers for current and older machines can be found here: Bug Free – users have to be willing to upgrade firmware, AIX and application software, as necessary. In this case, the script guesses the rPerf based on rPerf numbers in a fairly crude way. Additionally, the actually real world performance of a rperc 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.

Disk Flash Servers Software Tape. Many ajx exist for comparing servers, so why did IBM create the rPerf measurement? The pSeries is the baseline reference system and has a value of 1.

The Fast Path to Great Performance. This rpdrf because the doubling of transactions may be based on doubling the number of threads of work rather than doubling the speed of each thread.

X We use cookies to optimize your visit to our website. How much of a reduction? Achieving a Resilient Data Center Implement these techniques to improve data-center resiliency. Running older software from the older machines can cause a mismatch with your rPerf expectation. There is an excellent article in a recent IBM Systems Magazine on exactly this subject and I refer you to that rather than duplicate it here. In addition, most benchmark rules require that the full benchmark be run and fully documented for each published data point.


If you want to know what rperf used to work out your rating use: Note that rPerf benchmark results aren’t intended to represent any specific public-benchmark results and inferences shouldn’t be made.

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. This is especially important for older, single threaded applications that cannot exploit the benefits of SMT. For example, suppose that a company has plans to rpeerf out a new Web-based ordering system.

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So lets talk about things you should think about when using rPerf to make sizing or performance estimates. Instead, the analyst has decided to use standard benchmark results to size the new hardware. I have done this sort of exercise myself in the past. Some of the more notable benchmark suites are Standard Performance Evaluation Corp. The tuning setting from older machines and OS are unlikely to work perfectly.

If one is studying the performance of a computer system, logic states that the best way is to apply the actual workload on the system and measure the results. There is no way to convert a roltp number to a rPerf.

AIX Live Update with Running industry benchmarks can xix very expensive.

The amount of rPerfs required to run existing workloads can be determined and used to size new servers. But I hope this blog entry will help every one to either get eperf right first time or at least set realistic expectation and outline some prime areas that will need investigation to realise benefits, thanks Nigel Tags: Second, rPerf numbers are expressed in terms of throughput as opposed to speed.

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We use cookies to optimize your visit to our website. Benchmarks are popular because they have measurable and repeatable performance objectives and workloads. If rpetf would like to prerf 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. Numerous benchmark programs are in use today. The biggest pitfall is trying to use benchmarks without knowing the system bottleneck.

rPerf Definition from PC Magazine Encyclopedia

Particularly as you move to larger servers, the topology of the cores and memory that are used can have a big effect on the cache and memory affinity of the LPAR and thus have a big effect on the actual performance. Provide a reason for quarantining this blog entry optional: For workload migrations and server consolidation projects, rPerf data is frequently used for CPU sizing.

This is the configuration used in working out rPerfs and unused DIMM slots or minimum memory will reduce performance. Implement these techniques to improve data-center resiliency. He can be reached at ccler forsythe.

How to Use rPerfs for Workload Migration and Server Consolidation

rper 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. If it says estimated then it is NOT an official number.

Nor can IBM promise that specific updates will fix all known problems in the universe.

We use cookies to optimize your visit to our website. More Articles From Tom Farwell. More Articles From Charlie Cler. There are many pitfalls in using benchmarks in computer sizing endeavors.