z13 and later. It works on the z14 also. I would imagine that IBM saw the problem when they got to a large number of processors. The overhead internally probably became more expensive that the RSM program overhead. I don't know, but they may turn it on and off based on the number of processors in the CEC. Is it worth the RSM overhead if you only have a 4 processor machine verses one with more than a 100? Maybe Jim will comment.
Chris Blaicher Technical Architect Mainframe Development P: 201-930-8234 | M: 512-627-3803 E: cblaic...@syncsort.com Syncsort Incorporated 2 Blue Hill Plaza #1563 Pearl River, NY 10965 www.syncsort.com Data quality leader Trillium Software is now a part of Syncsort. -----Original Message----- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of Vernooij, Kees (ITOPT1) - KLM Sent: Friday, December 15, 2017 2:46 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: RSM Freemained Frames - When do they apply? Interesting detail: why does this work on z13 only and not on z14? Grtn, Kees. > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] > On Behalf Of Jim Mulder > Sent: 15 December, 2017 3:46 > To: IBM-MAIN@LISTSERV.UA.EDU > Subject: Re: RSM Freemained Frames - When do they apply? > > RSM will free frames if available frames are in short supply. > If you obtain a smaller amount, get it backed, and then release it, > you may be more likely to observe the frames being retained. > > Jim Mulder z/OS Diagnosis, Design, Development, Test IBM Corp. > Poughkeepsie NY > > > Running z/OS V2.2 on a z13. "D DIAG" shows FREEMAINEDFRAMES(YES) > > > > I'm not trying to solve any specific problem. I'm just curious. > > > > I'd like to see the behaviour in different situations when real > > storage (frames) has been kept as part of RSMs new "freemained > > frames" feature after the virtual storage has been released > (freemained). > > > > Sample program is obtaining a couple of 10MiB areas, then assessing > > each page so to make sure it is backed with real storage. Some of > > the areas are then released again. I was expecting to be able to > > still access the released pages because RSM decided to keep the > > frames. Am getting S0C4 instead. > > > > > > Obviously, RSM considers it unnecessary to keep the frames as > > freemained frames. > > > > > > What, if anything, can I do to have RSM keep the frames when the > > storage is released? > > Peter Hunkeler > > > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, send > email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN ******************************************************** For information, services and offers, please visit our web site: http://www.klm.com. This e-mail and any attachment may contain confidential and privileged material intended for the addressee only. If you are not the addressee, you are notified that no part of the e-mail or any attachment may be disclosed, copied or distributed, and that any other action related to this e-mail or attachment is strictly prohibited, and may be unlawful. If you have received this e-mail by error, please notify the sender immediately by return e-mail, and delete this message. Koninklijke Luchtvaart Maatschappij NV (KLM), its subsidiaries and/or its employees shall not be liable for the incorrect or incomplete transmission of this e-mail or any attachments, nor responsible for any delay in receipt. Koninklijke Luchtvaart Maatschappij N.V. (also known as KLM Royal Dutch Airlines) is registered in Amstelveen, The Netherlands, with registered number 33014286 ******************************************************** ---------------------------------------------------------------------- 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
