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Paper Details


%T An Irregular Distributed Simulation Problem with a Dynamic Logical Process Structure
%A Ming Q. Xu, Stephen J. Turner, Nie Pin
%E J. Wexler
%B OUG\-11: Developing Transputer Applications
%X This paper describes a modeling problem which exhibits many
   features of more advanced distributed simulation: the
   simulation of biological population dynamics —
   "Host\-parasite interactions". It is a
   dynamical simulation in which certain species of hosts and
   parasites live, move randomly, breed and (as far as
   parasites are concerned) infect the hosts in a
   two\-dimensional ocean. Apart from its relevance to
   realistic biological studies, this simulation program does
   serve to illustrate many crucial ideas in dynamic time and
   event driven simulations. Our approach to the parallel
   implementation of this simulation requires the simulation
   objects (in this case, hosts and parasites) to be organised
   as LPs (Logical Processes) which can be created and
   destroyed dynamically at run time to reflect the birth/death
   of these simulation objects. In addition to their dynamical
   features, LPs must preserve the temporal aspects of the real
   world system. In other words, a global ordering of LP
   interactions (referred to here as actions) must be ensured
   to preserve the causality principle [1]. Also, the
   computational load can become imbalanced because the real
   world system or rather, the distribution of hosts and
   parasites in the underlying space is changing with time. The
   methods for counteracting this dynamical load imbalance will
   be described.We shall begin with the specification of the
   dynamical rules governing the behaviour of the hosts and
   parasites during the simulation.


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