It was thus said that the Great Sam Ismail once
> On Mon, 25 Jan 1999, Max Eskin wrote:
> > On Mon, 25 Jan 1999, Sam Ismail wrote:
> > > Yes but we're using those for a VCF project.
> > Using 80 C-64s in a single project? Heck, I'm curious...
> Were basically in the preliminary feasibility
study stages of building a
> massively parallel vintage computer. The point? To demonstrate that old
> hardware that can be picked up for pennies can be combined to attain
> amazing amounts of computing power.
The biggest problem will be communication speed
Depending deeply on the structure of the task.
> Hans Franke is the project leader. Currently we
are talking about the
> architecture of such a thing. The current wisdom from Hans is to use 1541
> drives instead since they would be easier to network and are self-booting,
> not to mention plentiful and cheap.
And you'll end up with a ring architecture,
since if I remember correctly,
each drive only had two IO ports on it. That is, if you don't hack some
hardware to get a parallel connection to each computer (like 10BaseT hubs
today). And you'll need to select your problem domain to complement the
speed issues you'll have in communication, or you may end up with something
that's slower than a single C-64.
Redarding th information Salam gave, your idea might be right, but
as you said, its also depending on the problem to solve. Also you
just imply that the conectionstructure will be a simple brute force
bus ... Just wait (or join the team).
-spc (Let's see ... 80 machines in a ring
distance between two nodes is 40 hops, and at 9600bps
(assuming the hardware can do that) you have one bit taking
104 uSec between nodes (with an additional .001 uSec per
foot, propagation delay you know 8-), so you have 1.04 mSec
per character per hop. So to send a one byte message to
an arbitrary node will take, on average, 40 mSec. Round trip
will therefore take nearly 1/10 second (and that's assuming
no delay between switching nodes---YMMV in actual use ... ))
a) what if there is no peer type network, but rather a structured
hirarchy of domains ?
b) what if there is a bus rather than a ring (with switching time)
c) What if the speed in the serial part of the network is higher ?
d) what if the amount of date transfered includes low overhead ?
Come in and join the definition team.
Ich denke, also bin ich, also gut