IBM Mainframe Discussion List <[email protected]> wrote on 05/12/2005 04:21:00 PM:
> ASN translation uses 16-bit unsigned number. The hardware > maximum is therefore 65535 (ASN zero is treated special > in some cases as a non-identifier). > As for the software maximum, that depends on the operating > system and the various IPL parameters. > -----Original Message----- > From: "Todd Burch" <[EMAIL PROTECTED]> > Sent: 5/12/2005 2:07 PM > To: "[email protected]" <[email protected]> > Subject: Max Address Spaces? > > ASCBASID is a halfword, defined as SIGNED in the Data Areas manual. It > looks like the # of address spaces can vary. (I'm not sure what goes into > this - but a quick jog though a few manuals makes me think it can vary per > installation). > Can there be more than 32,767 address spaces on a system? If not, would > the high order bit of the ASCBASID ever be on for any other reason? Although the architecture maximum is 65535 (16 bits), z/OS enforces a maximum of 32767 (15 bits) for MAXUSER in IEASYSxx. It would be a lot of work to track down and change all of the programs which use a LH instruction to fetch an ASID. We are not aware of any customer workloads for which a limit of 32767 address spaces is expected to become a growth constraint. Jim Mulder z/OS System Test IBM Corp. Poughkeepsie, NY ---------------------------------------------------------------------- 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
