ZIIPAWMT fiddling has issues as well as limits: With Hiperdispatch it's 3.2ms, double the 1.6ms without. That is the "limit" part of it. The "issues" part is, I think, to avoid too much IIPCP time and also I would expect undesirable cache effects.
I actually don't cover ZIIPAWMT in the new presentation. Largely because I don't want people fiddling with it. Cheers, Martin Martin Packer, zChampion, Principal Systems Investigator, Worldwide Banking Center of Excellence, IBM +44-7802-245-584 email: martin_pac...@uk.ibm.com Twitter / Facebook IDs: MartinPacker Blog: https://www.ibm.com/developerworks/mydeveloperworks/blogs/MartinPacker From: Mike Schwab <mike.a.sch...@gmail.com> To: IBM-MAIN@listserv.ua.edu Date: 23/01/2014 15:57 Subject: Re: Resistance to Java. Sent by: IBM Mainframe Discussion List <IBM-MAIN@listserv.ua.edu> In order to cut the delays with a busy zIIP, wouldn't another workaround be to reduce to the delay from 3200 microseconds? Experiment with 2500, 2000, 1500, 1000, 700, 500, 400, ... until delay is reduced. Then creep it up by 100 if the zIIP utilization drops or GP rises and a little more delay is acceptable. On Thu, Jan 23, 2014 at 3:46 AM, Martin Packer <martin_pac...@uk.ibm.com> wrote: > I'm also talking about this. In the final throes of having a presentation > I aim to put on Slideshare (and give at any suitable venue). > > The message is important: DB2 V10 changes the way we view zIIP capacity. > The other message is important: zIIP Capacity Planning IS very feasible. > > And at the risk of annoying people with blatant self promotion :-) see: > > https://www.ibm.com/developerworks/community/blogs/MartinPacker/entry/ziip_address_space_instrumentation?lang=en > > Cheers, Martin > > Martin Packer, > zChampion, Principal Systems Investigator, > Worldwide Banking Center of Excellence, IBM > > +44-7802-245-584 > > email: martin_pac...@uk.ibm.com > > Twitter / Facebook IDs: MartinPacker > Blog: > https://www.ibm.com/developerworks/mydeveloperworks/blogs/MartinPacker > > > > From: Norbert Friemel <nf.ibmm...@web.de> > To: IBM-MAIN@listserv.ua.edu > Date: 23/01/2014 09:01 > Subject: Re: Resistance to Java. > Sent by: IBM Mainframe Discussion List <IBM-MAIN@listserv.ua.edu> > > > > On Thu, 23 Jan 2014 15:59:23 +0800, David Crayford wrote: > >>On 22/01/2014 11:53 PM, Skip Robinson wrote: >>> IBM is currently warning customers that over-using ZIIPs may lead >>> to serious performance problems because of the way z/OS manages them > vs. >>> the way it manages general purpose CPs. >>Can you supply a link wrt that information? >> > > Google found: > https://www.ibm.com/developerworks/community/blogs/22586cb0-8817-4d2c-ae74-0ddcc2a409bc/entry/december_17_2012_6_07_am3?lang=en > > > http://ibmdatamag.com/2013/04/performance-and-capacity-considerations-for-ziip-engines/ > > > Norbert Friemel > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > > > > Unless stated otherwise above: > IBM United Kingdom Limited - Registered in England and Wales with number > 741598. > Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN -- Mike A Schwab, Springfield IL USA Where do Forest Rangers go to get away from it all? ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN Unless stated otherwise above: IBM United Kingdom Limited - Registered in England and Wales with number 741598. Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
