I would say that on the average the z9 is 1.48 times faster , but that number
depends on what the program is doing. The number could be 1.1 to 1.8 depending
on what the batch program is doing. It's the old - your mileage will vary
comment
The purpose of PCR is to deal with the flux factor
Steve Finch
-Original Message-
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf
Of Charles Mills
Sent: Wednesday, July 18, 2012 2:46 PM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: Help with elementary CPU speed question
Jon, thanks for the thoughtful reply. Much appreciated.
You say the z900 is 1/8 as fast (powerful, whatever, fill in your favorite
word) as the z9. That's a combination of two factors, right? Each CPU on the z9
is 1.48 times as fast as those on the z900, and in addition the -722 has 22 of
them, while the -2C3 has only three, is that right? I am mostly interested at
this moment in CPU time. I know it's not the only thing, and it's not the same
thing as wall clock time, but it is what the company is going to be billed for
so it is a (the?) critical factor at this moment. So I think my focusing on
relative CPU speed rather than total box power (CPU's only, or CPU's and I/O)
is correct at this time. Any thoughts?
Charles
-Original Message-
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf
Of Jon Butler
Sent: Wednesday, July 18, 2012 11:12 AM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: Help with elementary CPU speed question
As has been pointed out, there are many IBM tools such as zPCR that you can
download to help with this exercise. The tools require either a good estimate
or RMF data from the LPARs to give you an accurate comparison. In running one
job anything can happen to distort the figures.
However, I think a rough calculation without regard to the other work in the
LPARs on the several CECs can give you an idea of what to expect. If we make
the assumption that both CECs are running a similar workloadnot bloody
likely give the CEC's design difference, disk drives, I/O configs, WLM
settings, OS version, etcbut using numbers from the latest MIPS ratings
here is what you are up against:
z9/722 rated at 1226 MSU
z900/2C3 rated at 144 MSU
I'd guess your job is going to run 1226/144 or 8 times slower. Let us know
what happens. Of course if the z9 is running at 95% and the z900 at 5%, your
job may be faster on the older CEC
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