In this paper, we describe the salient features of an implementation of a shared virtual memory, named KOAN, running on a iPSC/2 hypercube. We then discuss its performance on a non-numerical algorithm like ray-tracing as well as a numerical one: the Modified Gram-Schmidt algorithm. 1 Introduction Programming distributed memory parallel computers (DMPC) using a Shared Virtual Memory (SVM) seems to be in fashion. However, there is few such system available for DMPCs. Most of the research in this area has been done for a network of workstations such as IVY [18], Clouds [9, 21], Munin [6, 5], Memnet [10], Mach [27] and Chorus [1, 24]. These implementations concern only high latency networks and do not allow the comparison of the efficiency of different strategies for parallelizing algorithms. Distributed memory parallel computers with a hypercube or 2D-mesh topology have been commonly used for designing and testing parallel algorithms. Several results are now available. Hence, it woul...

: We describe in this paper a Parallel Observable virtual Machine (POM), which provides a homogeneous interface upon the communication kernels of parallel architectures. POM was designed so as to be ported easily and efficiently on numerous parallel platforms. It provides sophisticated features for observing distributed executions. Key-words: Distributed memory parallel computers, virtual machine, communication library, observation, traces (R'esum'e : tsvp) guidec@irisa.fr maheo@irisa.fr Unite de recherche INRIA Rennes IRISA, Campus universitaire de Beaulieu, 35042 RENNES Cedex (France) Telephone : (33) 99 84 71 00 -- Telecopie : (33) 99 84 71 POM : une machine parall`ele virtuelle incorporant des m'ecanismes d'observation R'esum'e : Nous d'ecrivons dans cet article une machine parall`ele virtuelle observable, la POM. Celle-ci offre une interface homog`ene au dessus des syst`emes de communication des architectures parall`eles. Elle a 'et'e con¸cue en vue d'un portage ais'e et ...