> -----Original Message----- > From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On > Behalf Of Tom Harper > Sent: Tuesday, February 05, 2008 5:46 PM > To: IBM-MAIN@BAMA.UA.EDU > Subject: Re: CPU time differences for the same job <Snipped> > Another valid question you ask is how to validate the results. I have a > favorite of mine, which is to run five interleaved runs of both the old > program (before changes) and the new program (after changes), preferably > during a quiet time on the machine, if you have any. I try to avoid > running under VM or on an LPAR which does not have dedicated physical > processors, but sometimes that is unavoidable. I then throw out the high > and low of each run, and take the means of the remaining data points > from the joblogs, both TCB and SRB. This has usually proven to be a > reliable method.
Thanks for that technique, it seems like a reasonable approach to use. I have no idea if the development LPAR has dedicated processors or not, but whether it does or not it's the only one I've got. "Quiet times" are like round tuits -- and those bad boys are very scarce everywhere... :) Thanks again for the testing idea. Peter This message and any attachments are intended only for the use of the addressee and may contain information that is privileged and confidential. If the reader of the message is not the intended recipient or an authorized representative of the intended recipient, you are hereby notified that any dissemination of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by e-mail and delete the message and any attachments from your system. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
