Originally posted by: SystemAdmin

Hi All,

I need to compare rperf numbers for a couple of servers, can someone please tell me how to read these numbers and compare please? What I have are:-

72.86 z
82.23 y
...for one
and:-

9.86h
...for the other..

Any help of guidance would be greatly appreciated.

Many thanks
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Originally posted by: SystemAdmin

Hi Steve,

rPerf are power values from a benchmark. You can find table with { server type / CPU speed / # of CPU } = rPerf .

If you 'got :
- server 1 {Type 1 / ??GHz / ?? Cpu } = 9.86 rPerf and use 90% of the all CPU in peak
- server 2 { Type 2 / 2GHz / 16Cpu } = 72.86

You can compare servers like this :
You application on your server 1 use : 90% * 9.86 = 8.8 rperf

To deliver the same power on the server 2 you need to allocate the same rperf to the partition :
( application needs ) / ( ( Server 2 rperf ) / ( #CPU ) ) => 8.8 / ( 72.86 / 16 ) = 1,9 CPU

If your question is about the z/y/h ... get notes on footpage

I hope this may help you.
Regards

Message was edited by: Rygel_3rd
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Originally posted by: nagger

I have just updated the rperf script to include POWER6 JS21, JS22, p520, p550 and p595.

You run this script on a machine or in a Logical Partition (LPAR) and it gives you the rperf or an estimate if your LPAR configuration is not an official number of CPUs.

For example, if the smallest official number is 100.0 rPerfs for a four CPU machine

• if you have 1 Dedicated CPU in a LPAR, it reports an estimate of 25.0
• if you have 1.5 Entitlement of shared CPUs, it reports an estimate 37.5
  
  • of course if its uncapped then you could be using more CPU cycles than this!

For older machines with no rperf rating it gives you the older roltp number.


Download from http://www-941.ibm.com/collaboration/wiki/display/WikiPtype/rperf

Hope this helps, Nigel
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