Lizette, We have USEZOSV1R9RULES=YES, but not sure about any effect on performance, because it has been setup for a while. MEMDSENQMGMT=DISABLED, so can't help with that one.
Jerry -----Original Message----- From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of Lizette Koehler Sent: Friday, October 27, 2017 11:36 AM To: [email protected] Subject: Question on some z/OS Tuning Parms USEZOSV1R9RULES and MEMDSENQMGT Dear List - I have been reviewing some parms that have been around in z/OS for a few years/decades? USEZOSV1R9RULES VSM USEZOSV1R9RULES(NO|YES): YES causes GETMAIN and STORAGE OBTAIN behavior to be unchanged from its historic behavior. NO causes GETMAIN and STORAGE OBTAIN behavior for user-region private area subpools that are both below and above the line to be implemented. Thus DQEs can be merged where possible. The default is YES to provide a seamless migration. However, IBM recommends that you specify USEZOSV1R9RULES(NO) to obtain a performance benefit for applications with long DQE/FQE chains for user-region private area subpools. To Display: D DIAG MEMDSENQMGT Allocation enhancement - MEMDSENQMGMT (Memory-based data set ENQ management) - ENQs managed in private storage instead of SWA blocks. Job will be non-restartable. - Enable via parmlib member or MVS command: . ALLOCxx: SYSTEM MEMDSENQMGMT(ENABLE) . SETALLOC SYSTEM,MEMDSENQMGMT=ENABLE - Exploit with DB2 APAR PM17542 (closed September 2010) To display: D ALLOC,OPTIONS I was wondering two things 1) How many are using the new algorithms these two parms brought in? 2) When you changed to the new functions, did you see any issues? Any products that need TLC? Are there any other that might also be helpful? Thank you Lizette Koehler statistics: A precise and logical method for stating a half-truth inaccurately ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN ________________________________ This e-mail message, including any attachments, is for the sole use of the intended recipient(s) and may contain information that is confidential and protected by law from unauthorized disclosure. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
