Tom: Good one. Way back in the 70's we had a rather large job (30+ hours and a couple of megabytes memory). The user insisted that it would run faster if it was made non swapable. We argued till we were blue in the face. Politics won and it was made no swapable and duh of course it didn't run any faster. A few time it even took longer (adjusted for input). We went up to the powers that be and asked for it to be put back. The people started to pagefix everything in sight and soon the whole system dragged to a dead slowness. Nothing else could be run. We tried putting maxuser (tso) down low (10 if I remember correctly) and then they howled because they couldn't monitor the job (long story best not told). They were doing some strange things and trying to out guess MVS (again long story). They had a programmer sitting at his desk constantly monitoring the job for the entire 30+ hours. We asked if the guy was going to be there every week and the answer was yes and we asked if that was really cost effective and the answer came back its not your budget MYOB.
Ed ________________________________ From: Tom Marchant <[email protected]> To: [email protected] Sent: Wednesday, August 10, 2011 1:24 PM Subject: Re: batch job as non-swappable On Wed, 10 Aug 2011 14:01:21 -0400, Scott Rowe wrote: >Why do you think you want to run this job as >non-swappable? I'd like to know too. Off the top of my head I can think of two possible reasons. Perhaps you have another. 1. You are establishing a cross-memory environment. 2. You think the job will perform better if it is non-swappable. IMO, number 1 is a good reason, number 2 is not. -- Tom Marchant ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
