Thank you! Richard Pinion
"Confidentially doc, I am the wabbit." Bugs Bunny Sent with Proton Mail secure email. On Wednesday, July 15th, 2026 at 8:35 AM, Rob Scott <[email protected]> wrote: > Richard > > The overhead to the fetch-causer is very minimal as SDSF MFM works by having > a CSVFETCH dynamic exit that copies the payload from the FTCHX parameter list > into a circular HV-COMM queue. The path length is quite small. > > The overhead you might see is extra CPU used in the SDSFAUX address space, > specifically the HSFMFMMN subtask as it periodically drains the HV-COMM queue > and processes the payloads. > > Depending on your requirements, you can select 3 levels of detail on the > FEATURE statement in ISFPRMxx : > > Level(1) - SDSF summaries the data on just the dsname > Level(2) - SDSF additionally summarizes the data by dsname+modname > Level(3) - SDSF additionally summarizes the data by dsname+modname+jobname > > Also note that you can dynamically start and stop the MFM feature at any time > using "F SDSF,S MFM" and "F SDSF,P MFM". The processed data is kept until you > issue "F SDSF,R MFM" which will reset the summary tables in SDSFAUX private > storage. > > You can track MFM statistics with "F SDSF,D MFM" and the SDSF task CPU usage > with "F SDSF,D TASK" > > Hope that helps > > Rob Scott > Rocket Software > ________________________________ > From: IBM Mainframe Discussion List <[email protected]> on behalf of > rpinion865 <[email protected]> > Sent: 15 July 2026 10:08 AM > To: [email protected] <[email protected]> > Subject: SDSF MFM Feature > > EXTERNAL EMAIL > > > > > Does anybody have information regarding the SDSF MFM feature and CPU > usage/overhead? > I have turned it on for the TECH and Development LPARs. But I am concerned > about what > might happen on the Production LPAR. Thanks in advance. > > Richard Pinion > > "Confidentially doc, I am the wabbit." > > Bugs Bunny > > Sent with [Proton > Mail](https://proton.me/mail/home<https://proton.me/mail/home>) secure email. > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN > > ================================ > Rocket Software, Inc. and subsidiaries ? 77 Fourth Avenue, Waltham MA 02451 ? > Main Office Toll Free Number: +1 855.577.4323 > Contact Customer Support: > https://my.rocketsoftware.com/RocketCommunity/RCEmailSupport > Unsubscribe from Marketing Messages/Manage Your Subscription Preferences - > http://www.rocketsoftware.com/manage-your-email-preferences > Privacy Policy - http://www.rocketsoftware.com/company/legal/privacy-policy > ================================ > > This communication and any attachments may contain confidential information > of Rocket Software, Inc. All unauthorized use, disclosure or distribution is > prohibited. If you are not the intended recipient, please notify Rocket > Software immediately and destroy all copies of this communication. Thank you. > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
