Memory intensive applications are not automatically disqualified, but need to be looked at individually, and in terms of what the impact will be on the rest of the systems/z/VM. As Joe and Barton both recommend (and you say you do), measurement is the only way to get a handle on whether a particular piece of work will be a good candidate or not, and whether it will fit within your existing capacity.
A particular CPU utilization on a RISC box is _likely_ to result in a higher CPU utilization on the mainframe. That's not guaranteed by any means, which just reinforces the need to actually measure on both platforms. Your current practice of having people actually install their application on Linux/390 and measure the results is absolutely the best way to go, in my mind. No guessing involved, real numbers gathered, etc. Mark Post -----Original Message----- From: Eric Sammons [mailto:[EMAIL PROTECTED] Sent: Friday, October 31, 2003 7:55 AM To: [EMAIL PROTECTED] Subject: Re: Perpetuating Myths about the zSeries What about memory intensive? And how do you gage the CPU intensive applications? For example we are planning to migrate some of our Solaris (SPARC) applications off of SPARC and into the z/VM Linux world. If I am looking at candidates for this migration I see systems (SPARC) with 10 - 30 percent utilization. What happens when I decide these word loads are good candidates with their low cpu usage on the SPARC platform but then install them into the Z environment and find out that they now have a cpu usage of 80 - 90 percent? Is this possible? Is there a good way to judge what applications on a given platform might be best suited for migration? Right now I am recommending that any candidate first do a QA of their application in the Z environment prior to do doing the full and final migration. thanks! Eric Sammons (804)697-3925 FRIT - Infrastructure Engineering "Post, Mark K" <[EMAIL PROTECTED]> Sent by: Linux on 390 Port <[EMAIL PROTECTED]> 10/30/2003 04:49 PM Please respond to Linux on 390 Port To: [EMAIL PROTECTED] cc: Subject: Re: Perpetuating Myths about the zSeries My answer was, and still is (and likely always will be) avoid any application that is CPU intensive. Yes, the zSeries has gotten faster, but so has Intel. The price-performance curve for CPU intensive work still favors Intel. I've seen nothing in the IBM announcements that would lead me to change any of the recommendations I've been making for the last 3 years. Unless and until the price-performance curve for zSeries matches that of Intel (or comes a couple of orders of magnitude closer), I will continue to make the same recommendations. Mark Post -----Original Message----- From: Jim Sibley [mailto:[EMAIL PROTECTED] Sent: Wednesday, October 29, 2003 7:31 PM To: [EMAIL PROTECTED] Subject: Re: Perpetuating Myths about the zSeries -snip- Linux on all sorts of platforms was just a gleam in someone's eye 5 years ago. It started getting pushed on the zSeries 3 years ago and the software and hardware have made great strides in the last 3 years. So CGI may not be appropriate today. So what is there we said was not appropriate 2 or 3 years ago that may be appropriate today on Linux zSeries? ===== Jim Sibley Implementor of Linux on zSeries in the beautiful Silicon Valley "Computer are useless.They can only give answers." Pablo Picasso __________________________________ Do you Yahoo!? Exclusive Video Premiere - Britney Spears http://launch.yahoo.com/promos/britneyspears/
