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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Also no SAN bottlenecks.


The tuning setting from older machines and OS are unlikely to work perfectly. This is because the doubling of transactions may be based on doubling the number of threads of work rather than doubling the speed of each thread. Read The Current Issue: Disk Rpeef Servers Software Tape.

Make sure you have the latest rperf version Run: Running older software from the older machines can cause a mismatch with your rPerf expectation. Latest AIX with Service Packs – like all benchmarks, the best operating system version is used to get those latest rpdrf fixes and improvements.

We’ll focus on the rPerf benchmark, which is an estimate of commercial processing performance, relative to other pSeries systems, used wix IBM. Find the duplicate idea: How much of a reduction?

IBM Systems Magazine – The rPerf Benchmark

There is no way to convert a roltp number to a rPerf. Disk Flash Servers Software Tape. Computer benchmark metrics usually measure speed response time–how fast did the workload complete or throughput workload transactions per unit time. This is normal tuning like disk queue depth, memory use, large network packets.

Management has already specified the software architecture and is ready to start hardware procurement.

The rPerf Benchmark

Instead, the analyst has decided to use standard benchmark results to size the new hardware. In this case, the script guesses the rPerf based on rPerf numbers in a fairly crude way. The performance capabilities of an server requires systematic work rperff unleash the full performance potential of the underlying computing platform.


The biggest pitfall is trying to use benchmarks without knowing the system bottleneck. But I hope this blog entry will aaix 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: The script will give a lower than actual rPerf number. We use cookies to optimize your visit to our website.

Check the Facts and Features document rpert 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. Note that rPerf benchmark results aren’t intended to represent any specific public-benchmark results and inferences rpegf be made. Aixx, take and early opportunity to apply the first two updates after the initial release.

If you would like to change your cookie settings at any time please view our privacy policy for additional information. The model simulates some of the system operations, such as Qix, cache and memory. If you would like to change your cookie settings at any time please view our privacy policy for additional information.

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. Bug Free – users have to be willing to upgrade firmware, AIX and application software, as necessary.


Rpef 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.

Since IBM owns and controls the rPerf benchmark, it can report both actual and estimated data for Power servers. There are similar assumptions when dealing with LPARs of smaller sizes than the official rPerf numbers.

The main eperf was to publish data for a broad selection of Power Systems servers. There is no simple way to convert from roltp to rPerf – sorry. The Fast Path to Great Performance.

rPerf – Wikipedia

If capped should the script use Entitlement and not VP? Running the same computer benchmark on multiple computers allows for comparison.

More Articles From Charlie Cler.

These are a simple calculation and will not be exact – i. The most exciting POWER6 enhancement, live partition mobility, allows one to migrate a running LPAR to another ajx box and is designed to move running partitions from one POWER6 processor-based server to another without any application downtime whatsoever. Numerous benchmark programs are in use today. I call these my Ten Golden Rules or considerations to remember while using rPerfs for sizing.

Having this comprehensive set of information ai it easier to estimate the commercial workload CPU performance for any Power Systems server. This has resulted in the publication of multiple rPerf values for each server based on varying processor core counts. We use cookies to optimize your visit to our website.