Otherwise known as the deficiencies of software emulation vs silicon. :) Peter
-----Original Message----- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of Phil Smith III Sent: Wednesday, March 13, 2019 4:11 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: STCKE faster than STCK! (was: instruction clock speed) Probably doesn't matter here, but note that on the zPDT, STCKF is actually about exactly an order of magnitude SLOWER at some rev levels. I found this, reported it, it's presumably fixed (but not on the zPDT I have access to, which I don't own). Doing 100,000,000 iterations of each: stck Ready(phsiii); T=1.24/1.24 14:02:14 stckf Ready(phsiii); T=12.07/12.08 14:02:28 "Special meaning of 'Fast'" -- This message and any attachments are intended only for the use of the addressee and may contain information that is privileged and confidential. If the reader of the message is not the intended recipient or an authorized representative of the intended recipient, you are hereby notified that any dissemination of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by e-mail and delete the message and any attachments from your system. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
