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________________________________ From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> on behalf of Robert Prins <000005be6ef5bfea-dmarc-requ...@listserv.ua.edu> Sent: Sunday, January 19, 2025 10:06:50 AM To: IBM-MAIN@LISTSERV.UA.EDU <IBM-MAIN@LISTSERV.UA.EDU> Subject: Does this make any sense? >From LinkedIn: <quote> 2 weeks ago I received the analysis data from a new client that wanted to reduce their CPU consumption and improve their performance. They sent me the statistical data from their z16 10 LPARS. Information about 89,000+ files. I analyzed their data and found 2,000+ files *that could be improved* and would save CPU when improved. *I pulled out 1 file to demonstrate a Proof of Concept (POC) for the client. I had the client run the POC and it showed a 29% reduction in CPU every time that file will be used. The 29% did not include 3 other major adjustments that would save an addition 14% CPU and cut the I/O by 75%.* This is just 1 file. The other files can save 3% to 52% of their CPU every time they are used in BATCH or ONLINE. </quote> I've been a programmer on IBM since 1985, and the above doesn't make any sense to me, how can changing just one file result in a 43% reduction in CPU usage? I've only ever been using PL/I, and using that I did manage to make some improvements to code, including reducing the CPU usage of a CRC routine by an even larger amount, 99.7% (Yes, ninety-nine-point-seven percent), but that was because the old V2.3.0 PL/I Optimizing compiler was absolute shite at handling unaligned bit-strings, but WTH can you change about a file to get the above reduction in CPU? Robert -- Robert AH Prins robert(a)prino(d)org The hitchhiking grandfather <https://urldefense.com/v3/__https://prino.neocities.org/index.html__;!!MwwqYLOC6b6whF7V!ko-qn9wK95Kd1gSIkYDc545UWxni5Zf8S0L46HC8S4NFJrzWhtG7vfgaSc0dy7aW6ByvCelU1bJXHRQWqA9g8qhKYWLX-u1mN7I$> Some REXX code for use on z/OS <https://urldefense.com/v3/__https://prino.neocities.org/zOS/zOS-Tools.html__;!!MwwqYLOC6b6whF7V!ko-qn9wK95Kd1gSIkYDc545UWxni5Zf8S0L46HC8S4NFJrzWhtG7vfgaSc0dy7aW6ByvCelU1bJXHRQWqA9g8qhKYWLX99Jf6Zs$> ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN This e-mail transmission contains information that is confidential and may be privileged. It is intended only for the addressee(s) named above. If you receive this e-mail in error, please do not read, copy or disseminate it in any manner. If you are not the intended recipient, any disclosure, copying, distribution or use of the contents of this information is prohibited. Please reply to the message immediately by informing the sender that the message was misdirected. After replying, please erase it from your computer system. Your assistance in correcting this error is appreciated. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
