There is no restriction on AR mode with AMODE 64. See DAT Address Translation in Chapter 3 of the POPS manual, specifically the right side of page 3-36
As determined by its address-space-control element, a virtual address space may be a 2G-byte space consisting of one region, or it may be up to a 16Ebyte space consisting of up to 8G regions. The RX part of a virtual address applying to a 2G-byte address space must be all zeros; otherwise, an exception is recognized. I also see no reason why AMODE 64 should be slower than AMODE 31, other than because you are probably hitting a lot of storage and having page faults. Chris Blaicher Technical Architect Mainframe Development Syncsort Incorporated 2 Blue Hill Plaza #1563, Pearl River, NY 10965 P: 201-930-8234 | M: 512-627-3803 E: [email protected] www.syncsort.com CONNECTING BIG IRON TO BIG DATA -----Original Message----- From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of Paul Gilmartin Sent: Tuesday, March 28, 2017 1:30 PM To: [email protected] Subject: Re: 64 bit execution above the bar On Tue, 28 Mar 2017 13:04:10 -0400, Steve Smith wrote: > >I presume IBM would like to deprecate and retire dataspaces completely, >although the eternal backward-compatibility may prevent that for 100 >years or more. > (Wow! We're halfway there!) My impression, also. Is there anytning possible with AR-mode that can't be done with AMODE 64? (May I assume that AR mode-mode and AMODE 64 are mutually exclusive?) What's the peformance consequence of AR-mode? I might expect it to be slower than AMODE 31 but faster than AMODE 64. I feel similarly about page protection keys. Segment protection should make them obsolete. -- gil ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] 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 [email protected] with the message: INFO IBM-MAIN
