64-bit version of OS/390 ?

[S390NEWS@isham-research.demon.co.uk (Phil Payne)]

In message  <35585F2B.F36885E3@CPUperform.com> Bob@CPUperform.com writes:

> The second step would be to provide 64 bit to the virtual space. If
> IBM does it the way the usually do, the old "stuff" for applications
> will still work with new services for a flat address space.

One of the pressures is new.  OS/390 is also UNIX, and the UNIX world
is showing signs of staggering uncertainly towards a 64-bit standard.

OS/390 running in an LPAR can't really see real storage any more, so
the term "real addressing" in OS/390 is a slight misnomer - but the
fact is that very many shops today are running virtual:real ratios
two or more orders of magnitude higher than what we used to think of
as good practice.  Within the OS/390 application space, linear
addressing of 64-bit spaces is less important - OS/390 provides quite
a few ways for applications to address more than 2GB.

--
Phil Payne
    data trader: High-performance cross platform data access and
                 job initiation. MVS, AS/400, Windows, OS/2, UNIX
                 http://www.zingsoft.com