Great explanation.
I know back in my mainframe days we referred to MIPS as "Meaningless Indicator of Processor Speed"
Scott
-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Justin Dearing
Sent: Thursday, June 25, 2015 1:50 PM
To: Midrange Systems Technical Discussion
Subject: Re: GHZ of an IBM Power system
I don't have the answer to your question. However, this wikipedia article lists the range of clockspeeds opf Power8 chips, which are whats in a modern IBMi.
https://urldefense.proofpoint.com/v2/url?u=https-3A__en.wikipedia.org_wiki_POWER8&d=BQICAg&c=_2JymsjkoSdpgdT4DmA4bg&r=-518Ilz5cVhEAzb0mENLKbaCPCUJ_jWIaTTDYAFSng4&m=wQwH29l1S7ua5wdEKqUNJsCs-9f4F3BfrEQ5_THpVCs&s=ZeiLkLH2CI3Vjz2yXlH2-JA0rTlOZBLq5k6v1l3W49o&e=
That being said clock speed is a bad measurement. Its like measuring lightbulb brightness in watts. For incadescent bulbs manufactured by sylvania and GE, it was an OK metric For the average american a 100 watt was a 100watt bulb. There were two big manufacturers to my knowledged, GE and Sylvania. Their wares were pretty damn similar. (Please lightbulb nerds, tell me I'm wrong here). There were big fluorescent tubes and rings, but they were the exception and needed special fixtures anyway. People understood wattage, sort of. At the very least they could relate it to their power bill which was measured in kilowatt hours.
Then along came CFLs and LEDs, and all of a sudden you need to know something about lumens and color, until someone makes an LED for under $5 that's actually really close to incandescent characteristics, patents the tech, and licenses the tech to everyone else, and then companies will stop innovating lightbulbs for 20-100 years.
Now in the 90s in the PC world CPUs made by intel got progressively faster.
They got more instructions per second (Mips), by having more transistors and running at a faster clock speed. Also, instructions got more sophisticated like the ability to do arithmic on 4 diffent pairs of values at the same time (Pentium MMX, which was good for graphics that had 4 channels red, green, blue+alpha (transparency)). If you have a really expensive server, you might have had 2 or 4 intel CPUs, and a version of Windows NT that could sort of divide the word between them.
But regardless, the idea was intel made your CPU. New CPUs came out all the time that were better and faster, and clock speeds were ever increasing.
Other than a few exceptions like the 100mhz 486 that was slower than a 90mhz pentium, And people believed meghertz meant speed of the computer to do work in an end user sense of the term.
Except, this completely fell apart if you bought a DEC Alpha, a Mac, or an AS/400. because mhz is a great measure of how fast a particular architecture of CPU is working, it doesn't take into account the robustness of the instruction set, the pipeline cache, or the fact that the assembly language that gets fed to a modern CPU is actually abstracted into a completely different form of microcode.
So, really, you question has a definite answer, but its the wrong question.
Justin
On Thu, Jun 25, 2015 at 2:13 PM Ketzes, Larry <lketzes@xxxxxxxxxxx> wrote:
If I wasn't clear, I'm looking on how to determine the CPU ghz of a
given system.
From: Ketzes, Larry
Sent: Thursday, June 25, 2015 2:12 PM
To: 'midrange-l@xxxxxxxxxxxx'
Subject: GHZ of an IBM Power system
I usually know the ghz of a system when I'm buying it, but is there a
way to see the ghz of a system that I didn't personally buy? I'm
thinking somewhere on a rack config or on the HMC?
Thanks, Larry
Larry Ketzes | Lead Enterprise Infrastructure Engineer | Midrange
Engineering | EI&A MetLife | 101 MetLife Way, Cary, NC 27513 | T.
919-907-5229 | lketzes@xxxxxxxxxxx<mailto:lketzes@xxxxxxxxxxx>
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