> On Aug 3, 2017, at 1:24 AM, Elardus Engelbrecht > <elardus.engelbre...@sita.co.za> wrote: > ————————SNIP------------------------------------ > I have seen that scenario a few times in my career. Something breaks or is > causing high CPU, excessive memory usage and swapping or slow transaction > response time. Result - everyone screamed for a major upgrade (hardware or > software) > > Sometimes a simple redesign of a program resolved most of the problems. One > example - I have handled a bad program problem scenario. It repeately opened > a VSAM dsn, do its thing and close. Repeat - wash, rinse, repeat all of this. > > Result - slow program, slow transaction times and lots of RACF SMF records > (access attempt) and SYSLOG messages. > > I told the programmers after looking at their programs, just please move the > OPEN outside the loop and the CLOSE after the loop. Voila, all were happy. I had a similar but slightly different issue with a programmer. They were accessing a VSAM file and each time they closed it and reopened it. I didn’t catch it till I saw a message on the console that the SMF buffer was full. I got a dump of the SMF address space and looked at it and sure enough there were thousands of VSAM open/close records. I talked to the programmers supervisor and it got changed but it took a couple of weeks. I guess I should have caught it before, but my plate was pretty full and I just didn’t have the time to look for stuff like that. I did add on a step to the dual SMF processing to catch stuff like that. Once in a while I spotted a possibility but a call to the programmer fixed the issue before it got into production.
Ed > > ... no, I did NOT get a T-shirt ... ;-) > > Groete / Greetings > Elardus Engelbrecht > > ---------------------------------------------------------------------- > 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
