When we lost our system we had an IEFUSI exit coded and active.
Jon L. Veilleux [EMAIL PROTECTED] (860) 636-2683 -----Original Message----- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of Mark Zelden Sent: Tuesday, July 18, 2006 12:02 PM To: [email protected] Subject: Re: 64-bits is a really big number! On Tue, 18 Jul 2006 11:28:16 -0400, Veilleux, Jon L <[EMAIL PROTECTED]> wrote: >Coding IEFUSI to limit its use is defeating the purpose of having large >address spaces in the first place. I don't agree. It can protect you from shotting yourself in the foot while still allowing legitimate usage that is planned and sized for properly. 64-bit doesn't really change this at all except that no one seems to know what sort of defaults are "good" at this point for MEMLIMIT. >I remember losing a system when we went to 31 bit addressing because a >smart application programmer wrote a program that did a GETMAIN for all >available storage and then referenced every page, which killed our >paging subsystem. 64 and 128 bit addressing only exacerbate this >problem. You just illustrated my point. IEFUSI could have protected your system in the above example. Regards, Mark -- Mark Zelden Sr. Software and Systems Architect - z/OS Team Lead Zurich North America / Farmers Insurance Group mailto: [EMAIL PROTECTED] z/OS and OS390 expert at http://searchDataCenter.com/ateExperts/ Mark's MVS Utilities: http://home.flash.net/~mzelden/mvsutil.html ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html ----------------------------------------- This e-mail may contain confidential or privileged information. If you think you have received this e-mail in error, please advise the sender by reply e-mail and then delete this e-mail immediately. Thank you. Aetna ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
