From: Larry McVoy <lm@mcvoy.com>
To: Michael Kj??rling <michael@kjorling.se>
Cc: tuhs@minnie.tuhs.org
Subject: Re: [TUHS] Photos of University Computer Labs
Date: Thu, 23 Dec 2021 06:19:58 -0800 [thread overview]
Message-ID: <20211223141958.GR24180@mcvoy.com> (raw)
In-Reply-To: <dd67a840-461f-4941-b93c-4e5e661fd8c0@localhost>
On Thu, Dec 23, 2021 at 01:05:55PM +0000, Michael Kj??rling wrote:
> On 22 Dec 2021 18:18 -0800, from lm@mcvoy.com (Larry McVoy):
> > The CP/M machines bring back different memories, using that and BDS
> > C because an 11/780 with 4MB of ram and 40 users meant each user was
> > getting 1KB so it swapped and swapped and swapped.
>
> 4 MB RAM and 40 users works out to 100 KB of RAM per user for me. Even
> accounting for a large at the time OS it should be several tens of
> kilobytes per user on average for actual useful data. So, because
> there's probably some detail here that means you're right and I'm
> wrong, how do you arrive at the figure 1 KB of RAM per user in that
> scenario?
Probably boomer doing math wrong. You are right, I'm wrong. Though I
will say that 100K/student was _painful_. Not enough to run make/cc in
any reasonable time. About the only thing that worked was ^t (I think
that was it) that showed you some basic info about performance.
next prev parent reply other threads:[~2021-12-23 14:20 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-22 15:11 Alexander Jacocks via TUHS
2021-12-22 20:31 ` josh
2021-12-22 21:07 ` Rob Pike
2021-12-22 21:15 ` Rob Pike
2021-12-23 4:28 ` Warren Toomey
2021-12-23 4:31 ` Alexander Jacocks via TUHS
2021-12-23 4:45 ` Rob Pike
2021-12-22 21:14 ` Win Treese
2021-12-23 0:48 ` Adam Thornton
2021-12-23 1:30 ` Adam Sampson
2021-12-23 2:18 ` Larry McVoy
2021-12-23 13:05 ` Michael Kjörling
2021-12-23 14:19 ` Larry McVoy [this message]
2021-12-23 15:29 ` [TUHS] Photos of University Computer Labs - now off topic Dr Iain Maoileoin
2021-12-23 16:00 ` Larry McVoy
2021-12-23 16:28 ` Dr Iain Maoileoin
2021-12-23 16:35 ` Larry McVoy
2021-12-23 16:47 ` Dr Iain Maoileoin
2021-12-23 22:15 ` Steve Nickolas
2021-12-24 20:57 ` Derek Fawcus
2021-12-23 16:02 ` Warner Losh
2021-12-23 16:19 ` Larry McVoy
2021-12-23 22:13 ` Steve Nickolas
2021-12-24 3:48 ` Theodore Ts'o
2021-12-28 21:45 ` Greg A. Woods
2021-12-29 16:58 ` Theodore Ts'o
2022-01-09 19:04 ` Stuart Remphrey
2021-12-25 0:00 ` [TUHS] Photos of University Computer Labs Mike Markowski
2021-12-29 2:44 ` Alexander Jacocks via TUHS
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