Packed decimal has been around since the beginning of time. Having dedicated instructions like the vector packed decimal ones only arrived with the Z14 and later mainframes,l And the point of the article I quoted was, with ARCH(12) and a Z14 Cobol code was timed as running up to 2x as fast as ARCH(11). So as has been said, if you have a Z14 or later and are not recompiling your code, you are potentially leaving MSU's on the table.
On Fri, Apr 24, 2020 at 2:24 PM Steve Beaver <st...@stevebeaver.com> wrote: > You are talking about packed unsigned math a that has been around in IBM > CPCS since forever > > Sent from my iPhone > > > On Apr 23, 2020, at 21:09, Charles Mills <charl...@mcn.org> wrote: > > > > I believe the Enterprise COBOL 6 compiler generates code that takes > advantage, assuming ARCH(12) is specified. > > > > If you are *not* specifying ARCH(nn) where 'nn' is the architecture > level of your oldest machine (don't forget DR!) then you are leaving MSU's > on the table. The ARCH(nn) level is two less than the "marketing number": a > z14 is ARCH(12), and so forth. > > > > Charles > > > > > > -----Original Message----- > > From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] > On Behalf Of Laurence Chiu > > Sent: Thursday, April 23, 2020 7:01 PM > > To: IBM-MAIN@LISTSERV.UA.EDU > > Subject: Vector Packed Decimal instructions experiences > > > > Just wondering if any shops have taken advantage of these new > instructions > > on the Z14 and Z15 and if so, how is your real world experience? > > > > https://ibmsystemsmag.com/IBM-Z/01/2018/vector-facility-z14 > > > > Looking at IBM's benchmarks they look pretty good and could have a > postive > > effect on reducing your 4HRA. > > > > ---------------------------------------------------------------------- > > 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 > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
