On Fri, May 8, 2015 at 1:14 PM, John Walker < [email protected]> wrote:
> What are the gains in doing the ziip thing? I am aware of it, as a > mainframe guy, but don't know the details. It might be helpful to learn in > any case. > There are two mains ones that I know of: (1) If you run zIIP enabled code on a zIIP, then that CPU is not part of your MSU for software billing purposes; (2) A zIIP engine always run "full speed", even if the normal CPs are "knee capped". However, you also need to be aware that you cannot run just anything on a zIIP. Not all system services are available to code running zIIP enabled. Also, getting the information on how to write zIIP enabled code is IBM proprietary. You cannot use then information except as allowed by IBM. You cannot disclose the information to others because requires signing an NDA. You cannot reveal the source to others, again due to the NDA. zIIP enabled code is really only for vendors. Now, you _can_ use a zIIP engine for application code _IF_ you enable zAAP on zIIP processing. But you can only write zAAP enabled code in Java. So it could be used for things like WAS transactions, CICS transactions (I think), or even batch programs. But again, only for Java language. And don't try to use JNI to slide some COBOL or HLASM in there because the JNI interface will turn off the zAAP eligibility while the JNI code is running. -- If someone tell you that nothing is impossible: Ask him to dribble a football. He's about as useful as a wax frying pan. 10 to the 12th power microphones = 1 Megaphone Maranatha! <>< John McKown
