Or, to expand on R.S.'s remarks, if your installation software charges
are based on peak 4-hour MSU* average during the month and this
application not only must run during the peak time but is sufficient to
raise that peak, then your software license charges will go up for that
month and there is a real dollar cost involved. On the other hand, if
your installation is on peak 4-hour MSU billing and the application is
easily scheduled for slack periods and does not contribute to the
monthly peak, the CPU time used is essentially free.
If you are not on peak 4-hour MSU billing and the application is
scheduled to use otherwise idle CPU and I/O resources, then the physical
costs are $0; but if it must be run during peak loads and contributes to
forcing an earlier upgrade of hardware to handle that load, then
hardware upgrade costs could be significant and should be at least
partially attributed to that application.
Another cost not mentioned is end-user waiting time. If cutting the
resources required by the application significantly improves the turn
around time to the end user, those improvements could be justified by
improvements to end-user productivity, which could have other desirable
side effects.
JC Ewing
*See other discussions on hardware-dependent relationship between CPU
seconds and Millions of Service Units (MSU).
On 06/12/2012 04:29 PM, Charles Mills wrote:
I think you are not getting an answer -- actually as I recall you got
several answers to this effect -- because the question is effectively "how
long is a piece of string?"
I use several LPARs for development. For various business reasons a CPU
second costs me and my employer nothing.
OTOH if you had a contract at a service bureau where you paid $5000 a month
up to 20,000 CPU seconds and $20,000 thereafter, then you just saved $15,000
per month.
If I improve my car's mileage from 20 to 30 miles per gallon how much money
do I save? Well, it depends on how many miles I drive and how much I pay for
gas.
Charles
-----Original Message-----
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@bama.ua.edu] On Behalf
Of Salva Carrasco
Sent: Tuesday, June 12, 2012 2:13 PM
To: IBM-MAIN@bama.ua.edu
Subject: Re: How many cost a cpu second?
Apart from the syntax error "How many" vs. "How much", My question is not
having much success.
In other terms:
If I have a STC consuming 25,000 cpus / secs per month, and I spend two days
optimizing it to reduce to 15,000.
Am I gaining money or loosing time ?
...
--
Joel C. Ewing, Bentonville, AR jcew...@acm.org
----------------------------------------------------------------------
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to lists...@bama.ua.edu with the message: INFO IBM-MAIN
