Different to the spirit of this mail thread I would like encouraging
you to invest in 64-bit versions of your software. Not only may the
distributors at some point choose to deprecate 31 (32) bit compat mode,
but all performance optimizations for the gcc compiler back-end for
new Z hardware are done for 64-bit only. 31-bit may or may not benefit
occasionally, too, but it is not a focus at all. I.e. while some workload
may possibly benefit from 31-bit because of its cache footprint,
generally speaking you should expect 64-bit to generate code that is
better optimized for recent Z hardware - or will be as we move on.
Linux on 390 Port <LINUX-390@VM.MARIST.EDU> wrote on 28.05.2018 08:15:57:
> From: Paul Edwards <mutazi...@gmail.com>
> To: LINUX-390@VM.MARIST.EDU
> Date: 28.05.2018 13:53
> Subject: Re: [LINUX-390] z/Linux 32-bit modules
> Sent by: Linux on 390 Port <LINUX-390@VM.MARIST.EDU>
>
> > And that, Paul, is why it’s not going to fly.
> > All of the 31 bit code would have to be reimplemented.
>
> > A bunch of other people do all that work and
> > take on all the risk to what end?
>
> Hi Alan.
>
> What code needs to be reimplemented? I think
> it is very unlikely any C code needs to be changed.
> A C programmer would need to go to a lot of
> effort to make their code 31-bit specific. It is
> more likely that it is already AM-anything.
>
> The existing 31-bit code merely needs to be run
> as AM64 and it will likely work fine.
>
> > What is the commercial value? What do they
> > get for their efforts?
>
> A decent platform that runs 32 bit binaries with
> a 4 GiB address space, and 64 bit binaries with
> a 16 EiB address space, just like all competing
> platforms provide.
>
> BFN. Paul.
>
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Mit freundlichem Gruß / Best regards
Ingo Adlung
Ingo Adlung IBM Deutschland Research &
IBM Distinguished Engineer Development GmbH
Chief Architect, and CTO Vorsitzender des Aufsichtsrats:
IBM Z and LinuxONE Virtualization Martina Koederitz
& Linux Geschäftsführung: Dirk Wittkopp
mail: adl...@de.ibm.com Sitz der Gesellschaft: Böblingen
phone: +49-7031-16-4263 Registergericht: Amtsgericht
Stuttgart, HRB 243294
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