On 9/14/07, Alan Altmark <[EMAIL PROTECTED]> wrote: > But the importance of that depends on what you want to know, doesn't it? > If you're interested in which Linux process is hogging the guest, the > absolute number is irrelevant.
But if you're comparing usage before and after some configuration change, it does become important. Simply the fact that you generate load in other virtual machines that were idle before, Linux will think the real business process takes more CPU resources per transaction than before. And Linux tools will tell you so, even though it is not true. That's what may make you bark up the wrong tree. But you *are* very right that performance monitor should be part of your Proof of Concept. We don't see a PoC fail these days because software does not work or cannot be found. We see it fail because people suffer from poor performance and have nobody to turn to for help in that new environment. So they get folks with Linux skills on discrete servers and they do all the wrong things because tuning with Linux on z/VM is rarely intuitive. Or folks using the wrong tools to measure and draw the wrong conclusions about the capacity of their installation and their TCO if they grow it. Rob -- Rob van der Heij Velocity Software, Inc http://velocitysoftware.com/ ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
