We found higher CPU was generally down to the new version of LE routines. COBOL itself was not found to be an issue CPU-wise, although there was only limited comparative testing done.
On Thu, 21 May 2020 at 13:48, Pommier, Rex <rpomm...@sfgmembers.com> wrote: > OPT(0) burns that much more CPU? Is this on all compiles or many or just > a few of them? If compiles are that bad using OPT(0), what will an OPT(2) > do? We're just starting our install of 6.3, going from 4.2 and this sounds > like something we need to be aware of. > > Thanks, > Rex > > -----Original Message----- > From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On Behalf > Of ste...@copper.net > Sent: Wednesday, May 20, 2020 5:08 PM > To: IBM-MAIN@LISTSERV.UA.EDU > Subject: [External] Re: What crashing COBOL systems reveal about > applications maintenance -- GCN > > We setup for OPT(1) because IBM said that was the thing to do initially. > > We’ve only recently been told to go OPT(2). > > We’ve also run into an interesting issue of COBOL 6.2 compiles using > OPT(0) taking > 10x CPU of same compile with 4.2. > > I don’t recall being told that we would see that level of CPU burn for > planning for capacity for migrating to 6.2. > > Regards > Steve Thompson > > --- frank.swarbr...@outlook.com wrote: > > From: Frank Swarbrick <frank.swarbr...@outlook.com> > To: IBM-MAIN@LISTSERV.UA.EDU > Subject: Re: [IBM-MAIN] What crashing COBOL systems reveal about > applications maintenance -- GCN > Date: Wed, 20 May 2020 21:28:33 +0000 > > We use OPT(1). Probably for no good reason. (And it was my decision, > meaning its easy enough to change!) > > ________________________________ > From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> on behalf > of Tom Ross <tmr...@stlvm20.vnet.ibm.com> > Sent: Wednesday, May 20, 2020 3:19 PM > To: IBM-MAIN@LISTSERV.UA.EDU <IBM-MAIN@LISTSERV.UA.EDU> > Subject: Re: What crashing COBOL systems reveal about applications > maintenance -- GCN > > >Suppose that they took a group of programmers and got the production > >online= programs to all compile with COBOL 6.2 and OPT(1). Would they > >see a signif= icant reduction in MSUs? Assuming they are running on z14s > minimally? > > I sure hope no one is using OPT(1) with 3rd generation COBOL! IBM expects > all users to compile with OPT(2) for production performance. I am honestly > not sure why we shipped OPT(1). Users should use OPT(0) if they want more > straight-forward debugging (no optimizations) and then after unit test > compile with OPT(2) for performance, and and never use OPT(1). > Alternatively, they could compile with OPT(2) for debugging and get used to > odd things like statements getting moved or deleted while debugging. > > Cheers, > TomR >> COBOL is the Language of the Future! << > > ---------------------------------------------------------------------- > 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 > > The information contained in this message is confidential, protected from > disclosure and may be legally privileged. If the reader of this message is > not the intended recipient or an employee or agent responsible for > delivering this message to the intended recipient, you are hereby notified > that any disclosure, distribution, copying, or any action taken or action > omitted in reliance on it, is strictly prohibited and may be unlawful. If > you have received this communication in error, please notify us immediately > by replying to this message and destroy the material in its entirety, > whether in electronic or hard copy format. Thank you. > > > ---------------------------------------------------------------------- > 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
