Wouldn't a specialty engine be excluded from the normal load sharing? By dispatching only its designated work and excluding other stuff (such as I/O interrupts) it ought to accomplish more of the targeted work than a general purpose engine. Is that reasonable?
True, there need not be anything special about the engine proper, only in the way it is managed and exploited. But, then, that begins to infringe on how we define 'optimization'. -----Original Message----- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of Edward Jaffe Sent: Wednesday, November 12, 2008 3:17 PM To: [email protected] Subject: Re: "The Register" article on HP replacing z Shane wrote: > Edward Jaffe wrote: > > >> Agreed 100%. There is no difference between the engines on >> full-capacity models. There is no "special" optimization of any kind. >> An engine is an engine. They run exactly the same instructions >> through exactly the same instruction pipeline in exactly the same way. >> > > C'mon Ed, you know that ain't true - at least one exception already > exists. Try IPL'ing z/OS native on one of your IFLs. > OK. There is that one command, used early in z/OS IPL, that is deliberately disallowed on specialty engines to prevent users from "accidentally" IPLing z/OS on them. (z/VM can IPL no problem because it doesn't use that command.) But, my point is that there is no optimization that allows them to process Linux for z instruction streams, Java, or other specialty engine-eligible work any faster. -- Edward E Jaffe Phoenix Software International, Inc 5200 W Century Blvd, Suite 800 Los Angeles, CA 90045 310-338-0400 x318 [EMAIL PROTECTED] http://www.phoenixsoftware.com/ ---------------------------------------------------------------------- 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 NOTICE: This electronic mail message and any files transmitted with it are intended exclusively for the individual or entity to which it is addressed. The message, together with any attachment, may contain confidential and/or privileged information. Any unauthorized review, use, printing, saving, copying, disclosure or distribution is strictly prohibited. If you have received this message in error, please immediately advise the sender by reply email and delete all copies. ---------------------------------------------------------------------- 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
