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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There are similar assumptions when dealing with LPARs of smaller sizes than the official rPerf numbers. Note that rPerf benchmark results aren’t intended to represent any specific public-benchmark results and inferences shouldn’t be made.

How much of a reduction? Since IBM owns and controls the rPerf benchmark, it can report both actual and estimated data for Power servers. Find the duplicate idea: The performance capabilities of an server requires systematic work to unleash the full performance potential of the underlying computing platform. Charlie Cler supports customers in a solutions-architect role at Forsythe Technology Inc.

How to Use rPerfs for Workload Migration and Server Consolidation

Disk Flash Servers Software Tape. The amount of rPerfs required to run existing workloads can be determined and used to size new servers. Performance tuning is always an iterative process of removing one performance bottleneck aox order to reveal the next performance bottleneck.

Many benchmarks exist for comparing servers, so why did IBM create the rPerf measurement? If you are breaking a lot of these assumptions then you may not get the performance you expected or hoped to achieve. If you would like to change your cookie settings at any time please view our privacy policy for additional information. For example, suppose that a company has plans to roll out a new Web-based ordering system. Posted January 3, Permalink. If you are some where rperrf these options then you may have to make a series of changes, upgrades or updates to achieve good performance on your new machine.


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Downtime needs to be built-in to allow the removal of problems in the above. 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.

Actual performance will vary, based on application and configuration details. 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.

The rPerf Benchmark

Instead, the analyst has decided to use standard benchmark results to size the new hardware. These are a simple calculation and will not be exact – i. Nor can IBM promise that specific updates will fix all known problems in the universe.

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 ai actual performance. Implement these techniques to improve data-center resiliency.

Management has already specified the software architecture and is ready to start hardware procurement. So lets talk about things you should think about when using rPerf to make sizing or performance estimates.

X We use cookies to optimize your visit to our website. X We use cookies to optimize your visit to our website. The biggest pitfall is trying to use benchmarks without knowing the system bottleneck. 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.


Numerous benchmark programs are in use today. These guidelines may help you achieve the performance that you expected. Bug Free – users have to be willing to upgrade firmware, AIX and application software, as necessary. 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.

Having this comprehensive set of information makes it easier to estimate the commercial workload CPU performance for any Power Systems server. Disk Flash Servers Software Tape. Firmware is Current – The firmware includes the Hypervisor and this has many performance enhancement tweaks and often based on field experience that you need working for you.

In this case, the script guesses the rPerf based on rPerf numbers in a fairly crude way.

This is normal tuning like disk queue depth, memory use, large network packets. Read The Current Issue: Note that rPerf can only be used for making comparisons within Power servers.