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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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IBM Systems Magazine – The rPerf Benchmark

I have done this sort of exercise myself in the past. 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 Tags: Having stated that, many people use rPerfs as a simplistic way of preparing a guesstimate to planning new machines based on running POWER workloads for both workload migration and server consolidation.

For example, suppose that a company has plans to roll out a new Web-based ordering system. If you are break just one or two rpeerf then only a little bit then you never know – “you might get lucky”. There is rperc simple way to convert from roltp to rPerf – sorry. How will the script get updated?

No Network Issues – as above. Previous Entry Main Next Entry. 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.

We’ll focus on the rPerf benchmark, which is an estimate of commercial processing performance, relative to other pSeries systems, used by IBM. More Articles From Charlie Cler. There are many pitfalls in using benchmarks in computer sizing endeavors. How do I use the vio If you would like to change your cookie settings at any time please view our privacy rpetf for additional information.


Running industry benchmarks can be very expensive. Note that rPerf can only be used for making comparisons within Power servers. Type in a Name: For LPARs the number may aid estimated but it is a simple maths calculation i. Instead, the analyst has decided to use standard benchmark results to size the new hardware. The Fast Path to Great Performance. We use cookies to optimize your visit to our website. Disk Flash Servers Software Tape. If it says estimated then it is NOT an official number.

In this aox, the script guesses the rPerf based on rPerf numbers in a fairly crude way. If capped should the script use Entitlement and not VP?

The script will give a lower than actual rPerf number. Particularly, take and early opportunity to apply the first two updates after the initial release. The model simulates some of the system operations, such as CPU, cache and memory. Computer benchmark metrics usually measure speed response time–how fast did the workload complete or throughput workload transactions per unit time.

If ai workload is better aligns with two threads per processor core, you should consider reducing the published POWER7 rPerf numbers by approximately 15 to 20 percent to get a more reasonable representation of its rPerf value. This has resulted in the publication of multiple rPerf values for each server based on varying processor core counts. Recent AIX version are much better out of the box but the basics still need to be monitored and checked. Since IBM owns and controls the rPerf benchmark, it can report both actual and estimated data for Power servers.

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 rperrf. Actual performance will vary, based on application and configuration details. Specifically, a reprf benchmark is a computer program that performs a strictly defined workload set of operations and returns some form of measurable result i.


This is especially important for older, single threaded applications that cannot exploit the benefits of SMT.


The biggest pitfall is trying to use benchmarks without knowing the system bottleneck. Benchmarks are popular because they have measurable and repeatable performance objectives and workloads. Disk Flash Servers Software Tape.

These requirements would make it extremely costly to publish multiple rperrf points for each Power Systems model. This is normal tuning like disk queue depth, memory use, large network packets. Note, 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, software design, and configuration.

These are a simple calculation and will not be exact – i. If you would like to change your cookie settings at any time please view our privacy policy for additional information. Read The Current Issue: Note that rPerf benchmark results aren’t intended to represent any specific public-benchmark results and inferences shouldn’t be made. The pSeries is the baseline reference system and has a value of 1.

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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. The official rPerf numbers rpegf current and older machines can be found here: IBM is currently completely out of “magic pixie dust” to fix problems without changes. Find the duplicate idea: Latest AIX with Service Packs – like all benchmarks, the best operating system version is used to get those latest performance fixes and improvements.