The WUQ and WEB are on the IBM unlicensed book shelf Just by looking at the control blocks seems they have pointers to the from LCCX which kind of makes sense when they can be scheduled to run On a certain processor Thanks for your help
Sent from my iPhone > On Nov 9, 2015, at 4:08 PM, John Arwe <johna...@linux.vnet.ibm.com> wrote: > >> On 11/6/2015 2:03 PM, michelbutz wrote: >> Thanks I understand that in the beginning SRB were quick and dirty however >> now they have become more robust >> If you can maybe guide me to the control blocks associated with them the >> same way TCB is associated with a task >> >> I am thinking of WEQ WUQ and SSRB > > Short answers [thanks for the kind shout-out Dave] from a lurker... > > - I'm "pretty sure" the WUQ and its member blocks (WEBs) are OCO. > There might be a strict subset documented in the pubs. > > - Preemptible SRBs (the class with 3 types that GA'd in 1995) all were > of the "can do long-running work" variety... "preemptible" meaning that > the dispatcher can pre-empt them in favor of work with higher > dispatching priority. The stern "quick and dirty only" warnings around > local and global SRBs were largely because they were non-preemptible... > once the dispatcher gave it a CPU, it had the CPU until it relinquished > control voluntarily, no preemption allowed. If you want more background > on preemption Michel, look for CMG/SHARE papers from Bernie Pierce. DB2 > V5 (the initial exploiter of client SRBs) used them specifically to run > queries intensive enough that the optimizer chose to parallelize them > (package + plan permitting, of course). > > - SRBs (preemptible or not) pre-date ZIIPs by years. I believe from > ZIIPs day 1 they could run any preemptible work unit (SRB or task). > > John Arwe > z/VM OpenStack enablement > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
