Re: ancient OS history, ARM is sort of channeling the IBM 360

John Levine <johnl@taugh.com> schrieb:

According to Lawrence D'Oliveiro  <ldo@nz.invalid>:

The difference was, with MFT, a program had to declare its memory
requirement before it could be started, and the only way to change that
was to stop the program and start it again. Whereas MVT allowed a program
to change its memory requirements while it was executing. (Whoah! Program
relocation requirement styleee!)

>
Nope. MFT partitioned memory into fixed sized areas when the system
started, MVT assigned each program as much memory as it said it
needed, and the areas could be reallocated between job steps. In every
case the JCL had to say how big a partition each job step needed.

When I first looked at the syntax for slurm, a workload manager
for HPC clusters (did somebody say "Job Entry Subsystem"?),
I found it striking how similar its syntax and semantics are to
JCL's job cards.  But then, they have a similar task.