Like it or not, most batch jobs are largely single CPU bound. They do not often multi-task. So I would suggest you use the ratio of the single processor numbers from LSPR. Still there are many ways YMMV
Dave Gibney Information Technology Services Washington State University > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:[email protected]] > On Behalf Of Charles Mills > Sent: Wednesday, July 18, 2012 11:46 AM > To: [email protected] > 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:[email protected]] > On Behalf Of Jon Butler > Sent: Wednesday, July 18, 2012 11:12 AM > To: [email protected] > 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 workload....not bloody > likely give the CEC's design difference, disk drives, I/O configs, WLM > settings, > OS version, etc....but 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 > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
