On 1/6/2023 9:40 pm, Seymour J Metz wrote:
It's a real Unix subsystem, but it certainly uses native services, e.g.,
STARTIO.
How does STARTIO relate to a UNIX kernel? The Linux kernel operates on
nearly all platforms without requiring any understanding of proprietary
I/O subsystems.
--
Shmuel (Seymour J.) Metz
http://mason.gmu.edu/~smetz3
________________________________________
From: IBM Mainframe Discussion List [IBM-MAIN@LISTSERV.UA.EDU] on behalf of
David Crayford [dcrayf...@gmail.com]
Sent: Thursday, June 1, 2023 9:36 AM
To:IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: z/OS 3.1: Now UNIXR Certified
On 1/6/2023 9:22 pm, Rick Troth wrote:
On 6/1/23 06:27, Matt Hogstrom wrote:
Similar experience. Not sure if its the same person but I had
dinner with Jeff Nick (former Felllow with Z) and his story was that
they needed Posix to meet a Federal requirement. He also said that
it was contentious internally and so they assembled a team and
isolated them from the others so they could make fast progress.
Dunno where it fits into the story, but I noticed that they used
Mortice Kern Systems "MKS Toolkit" for much of the required Unix/POSIX
utilities. (In Linux land, we'd say "the user space stuff".)
That impressed me because MKS Toolkit did the same thing for MS
Windows, a very rich approximation of Unix on top of another system.
Leveraging MKS TK was a brilliant step.
It cost IBM a ton of money to take ownership of the MKS code. The kernel
space (OMVS) is implemented using two PC routines that implement the
syscalls. IIRC, one is SS and the other is CP, so they must have
different functions. Either way, OMVS is a real UNIX subsystem running
on z/OS. It's not a shim or abstraction layer on top of native services.
In an update on how they were doing they were finally able to fork a
process. He said it was more like foooooooooorrrrrrrrkkkkkkkk.
Clearly, they fixed the performance and little did they know that it
was such a critical decision for the platform that it saved z/OS. I
think K8s is the USS of yesteryear. No one knows it yet but it will
add another 25 years to the platform.
Matt Hogstrom
PGP key 0F143BC1
0xF4292E2D2B970780 and others
On Jun 1, 2023, at 05:34, David Crayford<dcrayf...@gmail.com> wrote:
I've worked with a few ex-OE guys, including my close colleague who
used to the IBM DE running the OE project out of POK. Let me tell
you, some of the stories they have are absolutely fascinating! It's
my understanding that the POSIX certification was mainly pursued to
meet the requirements set by NASA. But here's an interesting twist:
NASA doesn't run a mainframe anymore.
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