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Deepankar Ramteke Software Engineer AtosOrigin India Pvt. Ltd, Mumbai Desk:+9122-28377824(472) e-mail: [EMAIL PROTECTED] www.atosorigin.com -----Original Message----- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of Gerhard Adam Sent: Thursday, September 20, 2007 10:39 AM To: [email protected] Subject: Re: WLC, WLM and all the rest: how optimize them ? > That's why you need to be careful in selecting the percentile. You want > WLM > to exclude the outliers when it makes it's calculations. True, enough. However using outliers also means being statistically astute rather than picking large percentages because they produce low PIs. In particular 50% (which has been suggested in some places) is ridiculous, since it represents a coin-toss ,... not a percentile ranking. If work doesn't behave consistently, then it can't be grouped together regardless of what WLM allows you to define. Also, let's consider what a sufficient number of jobs is. At a percentile of 80% completing within 1 minute, would require 7200 jobs per day through the service class (minimum) to be a meaningful reflection of a performance goal. In addition, we would expect 1440 of those jobs to MISS their goals unless there were spare resources. Anyway ... my two cents Adam ---------------------------------------------------------------------- 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 ---------------------------------------------------------------------- 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
