From: Green, Simon (SGreen@KRAFTEUROPE.COM)
Date: Mon Nov 04 2002 - 11:54:51 EST
Clock speed is of very limited use for comparing processor power, unless the
chip architecture is very similar: more similar than Power4 vs Power3.
I would also be very wary of your own tests: there are a lot more factors
involved in performance than the CPU. For a DB application, I/O speed is
probably more important than CPU power. You'd do better to find a benchmark
for a load similar to that which you will be running, if you want to compare
them.
Is your actual application running slower than expected?
Simon Green
Philip Morris ITSC Europe
AIX-L Archive at http://marc.theaimsgroup.com/?l=aix-l
<http://marc.theaimsgroup.com/?l=aix-l&r=1&w=2> &r=1&w=2
AIX FAQ at http://www.faqs.org/faqs/aix-faq/
<http://www.faqs.org/faqs/aix-faq/>
N.B. Unsolicited email from vendors will seldom be appreciated.
-----Original Message-----
From: Holger.VanKoll@SWISSCOM.COM [mailto:Holger.VanKoll@SWISSCOM.COM]
Sent: 04 November 2002 16:17
To: aix-l@Princeton.EDU
Subject: power4 performance
Hello,
does anybody have some real-workload performance data of p670/690 or
whatever runs a power4 that he likes to share?
I am a bit disappointed about the performance of my p670 @ 1100 mhz... its
only double as fast as a sp 9076-power3-II @ 375mhz.
So its half as fast per mhz.
I measured it using self-written applications and aix-tools like gzip...
same results.
If you look at
<http://www-1.ibm.com/servers/nl/eserver/pseries/p690/p690.html>
http://www-1.ibm.com/servers/nl/eserver/pseries/p690/p690.html
you see a rperf of 50.56 for a 32-way-1100mhz-power4 and a rperf of 27.65
for a 24-way-450mhz-rs64IV.
Double as much for 32x1100mhz as for 24x450mhz.
That means 32 power4 @ 1100mhz are as fast as 48 rs64iv @ 450mhz. Or 35200
power4-mhz equal to 21600 rs64iv-mhz.
Of course these are only benchmark-numbers. Thats why I am asking for
real-life/workload experience.
I would not expect a next-generation cpu like power4 to need 1.5 or 2 times
the clockrate of the older model to perform the same.
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