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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The official rPerf numbers for current and older machines can be found here: I call these my Ten Golden Rules or considerations rpetf remember while using rPerfs for sizing. No Network Issues – as above. If you want to know what rperf used to work out your rating use: If it says estimated then it is NOT an official number.

Disk Flash Servers Software Tape. We use cookies to optimize your visit to our website. 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. This has resulted in the publication of multiple rPerf values for each server based on varying processor core counts.

The Fast Path to Great Performance. Actual performance will vary, based on application and configuration details. We use cookies to optimize your visit to our website.

Numerous benchmark programs are in use today. If one is studying the performance of a computer system, logic states that the rpsrf way is to apply the actual workload on the system and measure the results.


However, there are times when this approach isn’t possible. If you have a different number of CPUs then a rough calculations is made based on the top number of CPUs and dividing appropriately.


For example, suppose that a company has plans to roll out a new Web-based ordering system. 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.

Free VMware and AIX Performance Monitoring

The biggest pitfall is trying to use benchmarks without knowing the system bottleneck. These are a simple calculation and will not be exact – i. Find the duplicate idea: We use cookies to optimize your visit to our website. There are many pitfalls in using benchmarks in computer sizing endeavors.

IBM Systems Magazine – The rPerf Benchmark

The script will give aixx lower than actual rPerf number. How will the script get updated? Management has already specified the software architecture and is ready to start hardware procurement. Read The Current Issue: Read The Current Issue: 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.

X We use cookies to optimize your visit to our website. Many benchmarks exist for comparing servers, so why did IBM create the rPerf measurement?

Note that rPerf benchmark results aren’t intended to represent any specific public-benchmark results and inferences shouldn’t be made. Posted January 3, Permalink. Make sure you have the latest rperf version Run: For LPARs the number may be estimated rpef it is a simple maths calculation i.

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

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. Benchmarks are popular because they have measurable and repeatable performance objectives axi workloads.


If you would like to change your cookie settings at any time please view our privacy policy for additional information. 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.

If capped should the script use Entitlement and not VP? For workload migrations and server consolidation projects, rPerf data is frequently used for Aid sizing. More Articles From Tom Farwell.

How to Use rPerfs for Workload Migration and Server Consolidation

Specifically, a computer benchmark is a computer program that performs a strictly defined workload set of operations and returns some form of measurable result i. Thanks for your use, help and feedback, Nigel Griffiths.

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. The rperf numbers are only available for certain number of CPUs.

Instead, the analyst has decided to use standard benchmark results to size the new hardware. He can be reached at ccler forsythe. Bug Free – users have to be willing to upgrade firmware, AIX and application software, as necessary.