We let them have at it, but protect the system. They can request what they want. IEFUSI will protect a preset amount of storage for system use (LSQA, etc.) and also protect the user against a "give me all" getmain.
If they abuse the issue, we will start seeing paging or aux storage shortages. Automation detects this with messages and uses PUAUXMON to determine the large users and kills them. This will, and has, hit production as well as test. If it is ever a valid usage, then we will have to allow for it without killing the system. All occurrences so far have been bugs, even in vendor code. Dennis Roach GHG Corporation Lockheed Martin Mission Services Flight Design and Operations Contract Address: 2100 Space Park Drive LM-15-4BH Houston, Texas 77058 Mail: P.O. Box 58487 Mail Code H4C Houston, Texas 77258 Phone: Voice: (281)336-5027 Cell: (713)591-1059 Fax: (281)336-5410 E-Mail: dennis.ro...@lmco.com All opinions expressed by me are mine and may not agree with my employer or any person, company, or thing, living or dead, on or near this or any other planet, moon, asteroid, or other spatial object, natural or manufactured, since the beginning of time. > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:ibm-m...@bama.ua.edu] On > Behalf Of Mark Zelden > > On Mon, 2 Mar 2009 22:04:35 +0000, Ted MacNEIL <eamacn...@yahoo.ca> > > >>It wouldn't tell you much at my shop. > >>Users are "penalized" for coding REGION=0M and dropped down to the > IEFUSI > default of 256M. > >>OTOH, one can get a larger region size by actually coding it here. > >>About 5 years ago I updated the exit to "stop playing games" and just > give > >any requests for more than 1024M the entire private area above the > line. > > > >I tend towards the 'slap your fingers' approach to region requests, > rather > than exits. > >Restricting region, when it may be needed, has never been my preferred > choice. > >RememberN there is a big difference between the virtual region > requested > and the real storage to back it up > >- > > So you would rather crash a system, than slap hands or rely on a system > exit for protection? I'd say you are in the extreme minority of system > programmers that would take that position. > > I admit that worrying about 31-bit region size on almost all my > systems > (and REGION=0M) is obsolete / history at this point, but I have a few > very small monoplex LPARs with less than 2G of real storage and > unconditional GETMAINs could still be a problem. > > What about 64-bit memlimit? Do you think limiting that with an exit is > also a bad approach? Same thing... just rewind 10 years. > > Mark > -- > Mark Zelden > Sr. Software and Systems Architect - z/OS Team Lead > Zurich North America / Farmers Insurance Group - ZFUS G-ITO > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
