Mmmmm - I was at a tech presentation by IBM a couple of weeks back. Selection for dispatch on a zIIP is likely to be severely more limited than Wayne intimates. From the IBM FAQ; "Eligible work that can be directed to the zIIP are portions of those requests made from the application server, to the host, via SQL calls over a DRDA® over TCP/IP connection." This is _very_ specific - work cannot be selected if generated from the same LPAR for example. Work originating from a Linux LPAR on same CEC (using hipersockets) is o.k. Not all eligible work will be redispatched on the zIIP - this will be decided by IBM (marketing ???) - maybe only 40% will be eligible. It appears the customer (or code) will have no means of influencing this.
Star schema parallel queries and some (DB2) utility workloads are also mooted as eligible - in these cases including workloads originating on the same environment. Seems this support is "less mature". Shane ... On Wed, 2006-04-05 at 08:51 -0500, Wayne Driscoll wrote: > John, > As you mentioned the zAAP processor was designed to reduce the licensing of > cost of System Z software when using applications coded in java. However, a > lot of the workload that IBM is pushing the System Z for isn't written in > JAVA such as SAP and Peoplesoft applications. However, these n-Tier > applications perform the bulk of their work on System Z via DB2 DRDA > requests, which run in enclave SRB's via the DDF address space. However, if > you are running a lot of this work, you may find that you need to upgrade > your CPU to support this work. By adding one (or more) zIIP processors, > this work will get done, without an increase in software licensing. I am > assuming that IBM will publish (maybe just to those willing to pay) the > API's that will allow those writing system level code to get dispatched in a > zIIP, but this is just a guess on my part. ---------------------------------------------------------------------- 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
