It's almost impossible to compare timings between processors except in the context of a well defined benchmark; run a different benchmark and you get a different answer. A classic example is comparing a 370/158 to a 4341; use packed decimal heavily and you get one answer; use floating point heavily and you get the opposite answer.
IBM used to publish instruction timings, and with every new model the rules got more complicated. The last one that I saw was for the 370/168, and it was full of special cases. I suspect that an instruction timing manual for, e.g., a z14, would be bigger than PoOps, and not terribly useful even if you were certain that the code would only run on that model. -- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 ________________________________________ From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> on behalf of Brian Chapman <bchapma...@gmail.com> Sent: Monday, August 12, 2019 8:48 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Instruction speeds Hi everyone, I did some searching, but I didn't find anything that really discussed this on the topic that I'm interested. Is there anything published that compares the cycle times of the most used instructions? For example; moving an address between areas of storage. I would assume that executing a LOAD and STORE would be much quicker than executing a MVC. Or executing a LOAD ADDRESS to increment a register instead of ADD HALF WORD. Or does this really matter as much as ordering the instructions so they are optimized for the pipeline? ---------------------------------------------------------------------- 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
