This script comes to handy when you try to find out the rPerf number of your AIX server:
This is a simple Korn shell script finds the Relative Performance rPerf number for the current machine or LPAR from Nigel Griffiths
This is a simple script that outputs the current machine or LPAR to give you the rPerf number.
The rperf numbers are only available for certain number of CPUs.
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: rperf -v
There are some problems:
- Older machines don’t have rPerf numbers so the script outputs the roltp number. There is no way to convert a roltp number to a rPerf. You will have to apply your own rules for that.
- Only certain numbers of CPU have official rPerf Numbers like 4 way, 8 way and 16 way. With LPARs, we can have lots of odd numbers of CPU. In this case, the script guesses the rPerf based on rPerf numbers in a fairly crude way. These are a simple calculation and will not be exact – i.e. it straightens out the SMP curve. The script will give a lower than actual rPerf number.
- Shared CPU LPARs that include a faction of a CPU are not handled well – the tool will find the Virtual Processor number and use that as the maximum number of CPUs the LPAR can get.
- On shared CPU LPARs the script is not Entitlement aware but entitlement is not a limiting factor on a uncapped LPAR any way. If capped should the script use Entitlement and not VP?
- How will the script get updated? – Easy it is a straight forward simple shell script – you can up date it yourself and give the script back to your AIX community – that is what Wiki’s are all about.
Want more information on rPerf and roltp?
- Power Systems (POWER7) rPerfs from http://www-03.ibm.com/systems/power/hardware/reports/factsfeatures.html
- Find out more about rPerf numbers from http://www.ibm.com/systems/p/hardware/rperf.html
- The current machines rPerf numbers can be found at http://www.ibm.com/systems/p/hardware/factsfeatures.html
- Older machine rPerf numbers can be found at http://www.ibm.com/systems/p/hardware/system_perf.html