On 7/19/07, Roach, Dennis <[EMAIL PROTECTED]> wrote:
I have been asked to determine the improvement of an IFL on a z9 BC over a z900. Mhz is something the people being presented to understand. It does not compare to the same speed on say INTEL.
It does not help you a think that people understand cycle time. As if you could compare a Pentium-M and a Celeron with the same clock speed. With previous S/390 generations I had a program to determine cycle time. With modern CPU's the criterion turned out to be how many instructions you can put extra in the loop without slowing it down... Apart from MIPS or MSU numbers that you will find, be aware - MSU ratings have been tweaked to make software license of z9 more competitive - speed increase from z900 to z9 is non-linear, in particular instructions popular with Linux have been optimized beyond that - when the application is not compiled to exploit z9 architecture, some advantage disappears - many ratings are for single-image z/OS workload on nn CPU's, which may not be what you do 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
