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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Read The Current Issue: Many benchmarks exist for comparing servers, so why did IBM create the rPerf measurement? The main reason was to publish data for a broad selection of Power Systems servers. There is no simple way to convert from roltp to rPerf – sorry. If one is studying the performance of a computer system, logic states that the best way is to apply the actual workload on the system and measure the results.
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. Disk Flash Servers Software Tape. 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.
Actual performance will vary, based on application and configuration details. If you are break just one or two and then only a little bit then you never know – “you might get lucky”. Read The Current Issue: The model simulates some of the system operations, such as CPU, cache and memory.
How to Use rPerfs for Workload Migration and Server Consolidation
Six can be reached through www. 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 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. The official rPerf numbers for current and aiix machines can be found here: Type in a Name: Charlie Cler supports customers in a solutions-architect role at Forsythe Technology Inc.
Sizing with rPerf but Don’t Forget the Assumptions (AIXpert Blog)
This is normal tuning like disk queue depth, memory use, large network packets. If you are breaking a lot of these assumptions then you may not get the performance you expected or hoped to achieve.
The tuning setting from older machines and OS are unlikely to work perfectly. If capped should the script use Entitlement and not VP?
Find the duplicate idea: If it says estimated then it is NOT an aiix number. I call these my Ten Golden Rules or considerations to remember while using rPerfs for sizing. Disk Flash Servers Software Tape.
The rPerf Benchmark
If you have a different number of CPUs then a rough calculations is made based on the top number of CPUs and dividing appropriately. If you want to know what rperf used to work out your rating use: More Articles From Tom Farwell.
In this case, the script guesses the rPerf based on rPerf numbers in a fairly crude way. Some of the more notable benchmark suites are Standard Performance Evaluation Corp.
How much of a reduction? Provide a reason for quarantining this blog entry optional: AIX Live Update with Downtime needs to be built-in to allow the removal of problems in the above.
Running the same computer benchmark on multiple computers allows for comparison. Numerous benchmark programs are in use today. Recent AIX version are much better out of the box but the basics still need to be monitored and checked.