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.
Performance tuning is always an iterative process of removing one performance bottleneck in order to reveal the next performance bottleneck.
These are a simple calculation and will not be exact – i. Simply stated, benchmarking refers to running a set of programs on various computer and network configurations and measuring the results. There are many pitfalls eperf using benchmarks in computer sizing endeavors.
More Articles From Tom Farwell. Additionally, the actually real world performance of a given server might be affected over time by improvements or bugs in the firmware, AIX, or the application while the official rPerf is seldom changed in the Power Systems Performance Report after the initial release of the server model. How do I use the vio How fperf the script get updated?
You will have to apply your own rules for that. Computer benchmark metrics usually measure speed response time–how fast did the workload complete or throughput workload transactions per unit time. This is especially important for older, single threaded applications that cannot exploit the benefits of SMT. The savvy performance analyst knows aox it’s neither feasible at this point fperf time nor cost-effective to set up actual performance testing of the new software.
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. AIX Live Update with Benchmarks are popular because they have measurable and repeatable performance objectives and workloads.
rPerf Definition from PC Magazine Encyclopedia
In addition, most benchmark rules require that the full benchmark be run and fully documented for each published data point.
Management has already specified the aiz architecture and is ready to start hardware procurement. 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.
I have done this sort of exercise myself in the past.
The official rPerf numbers for current and older machines can be found here: The script will give a lower than actual rPerf number. Many benchmarks exist for comparing servers, so why did IBM create the rPerf measurement?
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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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 model simulates some of the system operations, such as CPU, akx and memory. 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. The biggest pitfall is trying to use benchmarks without knowing the system bottleneck. Implement these techniques to improve data-center resiliency. 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.
Running older software from the older machines can cause a mismatch with your rPerf expectation. Bug Free – users have to be willing to upgrade firmware, AIX and application software, as necessary. Recent Rpref version are much better out of the box but the basics still need to be monitored and checked.
rperrf If it says estimated then it is NOT an official number. Since IBM owns and controls the rPerf benchmark, it can report both actual and estimated data for Power servers.
If you are break rlerf one or two and then only a little bit then you never know – “you might get lucky”. Make sure you have the latest rperf version Run: There is no way to convert a roltp number to a rPerf.