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 *pn 0,0**pl 290,10,270,4,10*
*lm0**lw 170* *ld8* *ps0*
*sj*
H. C. Ørsted Institute
Københavns Universitet
Universitetsparken 5
DK-2100 København Ø
Denmark
*qr*
1980-09-24
*nl2*
*sj*
*lm10*
Programme Committee Chairman
Dr. I. S. Torsun
Department of Computer Science
Brunel University
Uxbridge
Middlesex
UB8 3PH 
England
*rj*
*nl3**lm0*
*np 10* 
Enclosed is a abstract we would like to have considered for
ICS 1981.
We have not included any references in the abstract. For the
convenience of the referees a tentative list for the final paper
is enclosed.
*np 10*
*nl6*
*lm 80*
Sincerely
*nl4*
*sj*
Anders Lindgård
Lektor Lic. Scient.
(Lecturer Ph. D)
*lm 0**ps15*
*rj*
*sj*
*nl2*
*nl*
*ct*
A PRACTICAL APPROACH TO MULTICOMPUTER SYSTEMS
---------------------------------------------
*ld8*
*0010**nl 1*
Anders Lindgård, Jørgen Oxenbøll, Carsten Gyrn and Karl Aage Kristensen
H. C. Ørsted Institutet
Københavns Universitet
Universitetsparken 5
DK-2100 København Ø
Denmark
*rj*
*rh 1,A Practical Approach to Multicomputer Systems*
A multicomputer system capable of handling a large number of
identical computers has been developed. The hardware consist of
a danish RC8000 computer connected to a number of microprogrammed
bit-slice computers designed and developed at the H. C. Ørsted
Institute. The RC8000 instruction set including floating point
instructions is emulated on the microcomputers. The computers
are interconnected by a separate wordwide (24 bit) bus, on which
they exchange messages and datablocks of any length. The bus
is controlled by the microprogram in each computer. Hardware
modularity and simplicity has been considered of greater
importance in the design than speed, making the computers easy
to develop and cheap to build.
*np*
The system is designed to handle the very different needs a large group
of researchers in experimental and theoretical physics and chemistry have.
On one hand a theoretician may need months of central processor time and
on the other experimentalists need datacollection and control of their
experimental setups combined with extensive datahandling facilities.
In our system individual experiments are handled by local computers
attached in a hierarchical network to the multicomputer system.
Extensive graphical facilities are supported due to the need for
rapid graphical representation of raw data and results.
*np*
Standard peripherals as printer, disc and terminals are connected to
the mainframe RC8000 only, while the other computers handles more
specialized tasks as long term computing, the computer network for
experiments and the graphics system.
*np*
The main idea in the system is that processes may be distributed among
the computers so that  communication between processes in
different computers is relatively rare, thus avoiding overload of
the intercomputer bus.
*np*
The system software is based on the RC4000 monitor by Brinch Hansen
and is a clean extension of that system to handle processes independent
of which computer is actually running the process.
*np*
From a user point of view the system appears as a single multiprogrammed
computer. As a consequence of this
 it was trivial to change the operating systems to handle
processes in other computers.
*np*
In the paper we will discuss the merits of our design compared with
the more popular multiprocessor systems. The hardware and software
of the multicomputer system will be described and discussed in detail.
*nl**np*
This research has been partially supported by the Danish Natural Science
Research Counsil
*ef*
▶EOF◀