IBM, with V2.1, has added instruction counts to the type 30 SMF records. These counts are done when HIS is active on the processors for the LPAR. I do not know how they are doing it, but a reasonable guess is they are using the new instructions to get the current counts from the hardware each time a context switch is done. I can only hope they do it for EVERY context switch and as close to the switch as possible, which is what QCM did to improve SMF timings.
I have not been able to run against a V2.1 system yet, but I am hoping that for the exact same work I will see about the same instruction counts, even though the reported CPU time might vary significantly based on how busy a machine is. Chris Blaicher Principal Software Engineer, Software Development Syncsort Incorporated 50 Tice Boulevard, Woodcliff Lake, NJ 07677 P: 201-930-8260 | M: 512-627-3803 E: cblaic...@syncsort.com -----Original Message----- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of DASDBILL2 Sent: Monday, February 03, 2014 9:23 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: CPU time >How can it? Unless it's the highest priority. Using the operating system source code [1], figure out which is the highest priority code in the whole system. Then insert a very small amount of code in it [2]. >And, shades of Heisenberg, what about itself? Only a very small amount of code was inserted. Bill Fairchild [1] The lack of current availability of the source code is possibly one good reason why this product is no longer marketed. [2] Inserting any code at all into the operating system is no longer viewed as a good thing to do, which is another possible reason why this product is no longer marketed. See [1] above for more discussion of inserting code into the operating system. ----- Original Message ----- From: "Ted MacNEIL" <tedmacn...@bell.blackberry.net> To: IBM-MAIN@LISTSERV.UA.EDU Sent: Saturday, February 1, 2014 12:08:42 AM Subject: Re: CPU time ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN ________________________________ ATTENTION: ----- The information contained in this message (including any files transmitted with this message) may contain proprietary, trade secret or other confidential and/or legally privileged information. Any pricing information contained in this message or in any files transmitted with this message is always confidential and cannot be shared with any third parties without prior written approval from Syncsort. This message is intended to be read only by the individual or entity to whom it is addressed or by their designee. If the reader of this message is not the intended recipient, you are on notice that any use, disclosure, copying or distribution of this message, in any form, is strictly prohibited. If you have received this message in error, please immediately notify the sender and/or Syncsort and destroy all copies of this message in your possession, custody or control. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
