15 Mar
2023
15 Mar
'23
5:23 p.m.
On 3/15/23 18:32, Paul Koning via cctalk wrote:
Apart from spooling, which uncouples slow I/O from execution, there is also
"multiprogramming", which means being able to run more than one job
concurrently. Timesharing does that, of course, but I think multiprogramming was intended
to refer to batch systems that did so.
Yes, the IBM 709x ran in single-job fashion. I don't think
it had interrupts, so breaking off one program to schedule
another was not possible. Also, it had no memory
protection. We had a 7094 at Washington University in the
late 1960s, and it was the main computer resource on
campus. When the moved up to a 360/50, they were able to
benefit from multiprogramming, and got a boost in
throughput, although the 7094 was QUITE a bit faster than
the 360/50.
Jon