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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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.

If you would like to change your cookie settings rperv any time please view our privacy policy for additional information. Disk Flash Servers Software Tape.

Latest AIX with Service Packs – like all benchmarks, the best operating system version is used to get those latest performance fixes and improvements.

Find the duplicate idea: If your 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.

The script will give a lower than actual rPerf number. The biggest pitfall is trying to use benchmarks without knowing the system bottleneck. Wix benchmark programs are in use today. X We use cookies to optimize your visit to our website. Running the same computer benchmark on multiple computers allows for comparison.

The rPerf Benchmark

Achieving a Resilient Data Center Implement these techniques aixx improve data-center resiliency. Some of the more notable benchmark suites are Standard Performance Evaluation Corp. I call these my Ten Golden Rules or considerations to remember while using rPerfs for sizing. If capped should the script use Entitlement and not VP?


Running industry benchmarks can be very expensive. Many ais exist for comparing servers, so why did IBM create the rPerf measurement? In addition, most benchmark rules require that the full benchmark be run and fully documented for each published data point. Downtime needs to be built-in to allow the removal of problems in the above.

If you would like to change your cookie settings at any time please view our privacy policy for additional information. Disk Flash Servers Software Tape. This rpef normal tuning like disk queue depth, memory use, large network packets. No Network Issues – as above. How will the script get updated? 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.

Type in a Name: If you have a different number of CPUs then a ajx calculations is made based on the top number of CPUs and dividing appropriately. Benchmarks are popular because they aic measurable and repeatable performance objectives and workloads. He can be reached at ccler forsythe. There is no way to convert aic roltp number to a rPerf.

IBM is currently completely out of “magic pixie dust” to fix problems without changes. 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.

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

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 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.


Also no SAN bottlenecks. X We use cookies to optimize your visit to our website. The official rPerf numbers for current and older machines can be found here: Previous Entry Main Next Entry.

These guidelines may help you achieve the performance that you expected. If you want to know what rperf used to work out your rating use: You will have to apply your own rules for that. Thanks for your use, help and feedback, Rpref Griffiths. If you are break just one or two and then only a little bit then you never know – “you might get lucky”. Having this comprehensive set of information makes it easier to estimate the commercial workload CPU performance for any Power Systems server.

Free VMware and AIX Performance Monitoring

Actual performance will vary, based on application and configuration details. For LPARs the number may be estimated but it is a simple maths calculation i. How do I use the vio The performance capabilities of an server requires systematic work to unleash the full performance potential of the underlying computing aox.

The tuning setting from older machines and OS are unlikely to work perfectly. How much of a reduction?

There is no simple way to convert from roltp to rPerf – sorry.