On Tue, 24 Nov 2020 at 14:12, Kirk Wolf <k...@wolf-associates.com> wrote: > > I'm doing ISPF-compatible member enqueues, while loading a bunch of members > with BPAM/BSAM. > I'm following the doc, which indicate SCOPE=SYSTEMS:
OK. But SCOPE=SYSTEMS isn't a different namespace such that a competing program within the same system won't see it if it asks for SCOPE=SYSTEM. (I'm speaking of obtaining an ENQ here - not of explicitly scanning for existing ones.) In other words, if you have just the one system, I can't see any reason to be specifying SYSTEMS. If ISPF has ENQ'd using SYSTEMS, your program using SYSTEM will still wait for it. And the other way round. > I guess that I don't understand the distinction between GRS and sharing > within a SYSPLEX wrt SCOPE=SYSTEMS. I had assumed that SCOPE=SYSTEMS is > not only GRS, but also for serializing across members of a sysplex. No? Yes, it is. But for your situation, who cares; if you have neither GRS nor a Sysplex, then just use SYSTEM. Of course you might want the same code to work safely in sharing environments, so you can either test for the environment, or better, leave the management of cross-system stuff to whoever configures these things on the target (customer?) system. SYSTEM level ENQs can be filtered by name, selectively promoted to SYSTEMS, and so on. > BTW: with SCOPE=SYSTEM, it is blazing fast. So my suspicion is that you do actually have more than one system sharing. But why, if it's IBM's Dallas setup in a VM? Tony H. > On Tue, Nov 24, 2020 at 12:48 PM Tony Harminc <t...@harminc.net> wrote: > > > On Tue, 24 Nov 2020 at 13:39, Kirk Wolf <k...@dovetail.com> wrote: > > > > > ISGENQ > > > REQUEST=OBTAIN, > > > COND=YES, > > > QNAME=QN,RNAME=RN,RNAMELEN=52, > > > CONTROL=EXCLUSIVE, > > > SCOPE=SYSTEMS, > > > RETCODE=RC,RSNCODE=RSN, > > > ENQTOKEN=MYTOK > > > > > I notice that Obtains takes about 14ms and Releases about 12ms, so 100 > > > iterations is almost 3 seconds. > > > > > > I guess that makes sense with SCOPE=SYSTEMS, but I'm doing this on a > > system > > > that isn't on a sysplex (but it is running second level at IBM RDP). > > > > I don't understand why you have SCOPE=SYSTEMS... Are you sharing a > > resource across systems that are not in a sysplex? This is possible > > with GRS, but not common these days, and can lead to problems. That > > you are running in a VM doesn't seem relevant. > > > > Tony H. > > > > ---------------------------------------------------------------------- > > 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 ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
