> and I spend two days optimizing it What is your time worth? Are you an employee whose salary is already a sunk cost, or are you a $250/hour consultant?
You don't have to answer that question, but my point is that the value of your time figures into the question "Am I gaining money or loosing time ?" Charles -----Original Message----- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@bama.ua.edu] On Behalf Of Joel C. Ewing Sent: Tuesday, June 12, 2012 6:43 PM To: IBM-MAIN@bama.ua.edu Subject: Re: How many cost a cpu second? 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 ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: INFO IBM-MAIN
