>From a performance only point of view, yes, an all GP configuration might be >better, if none of the GP's were capped.
The point of the z/IIP and z/AAP was to get you horsepower without increasing your software licensing fees. It is much cheaper to have 5 GPs and 5 z/IIPs or z/AAPs rather than 10 GP's. Putting aside software costs is un-realistic. Software is very expensive. With regard to the book question, it makes no difference if 2 GP's are on 2 different books or a GP and a z/IIP are on different books. You definitely want all the processors associated with a LPAR on the same book. The cost to switch books is very expensive, but all that can be another thread. Chris Blaicher Phone: 512-340-6154 Mobile: 512-627-3803 -----Original Message----- From: IBM Mainframe Discussion List [mailto:ibm-m...@bama.ua.edu] On Behalf Of Mark Zelden Sent: Wednesday, February 03, 2010 4:38 PM To: IBM-MAIN@bama.ua.edu Subject: Re: IBM countersues Neon over zPrime accelerator I'm not trying to start an argument, but performance is not about "beliefs" or "gut feelings". It's about measurements and data / facts to back it up. The fact is, that there is overhead in engine switching to move work over to a specialty processor, so I'm not inclined to believe that from a performance perspective, overall, a system would run better with a split between zAAPs and GPs as opposed to all GPs. Now, I can see that WAS could run better since the zAAP(s) could be sitting there servicing the java work without competition - but the rest of the system could be CPU starved (also, remember the additional overhead if these engines are in another book). So I guess my point is, putting aside software costs, it is better from an overall system performance perspective to have all GPs. Mark -- Mark Zelden Sr. Software and Systems Architect - z/OS Team Lead ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
