Extending the Operating System at the User Level: the Ufo Global File System
A. D. Alexandrov, M. Ibel, K. E. Schauser, and C. J. Scheiman,
1997 Annual Technical Conference on UNIX and Advanced Computing Systems (USENIX'97).
We use the term ubiquitous supercomputing to refer to systems that integrate low- and mid-range computing systems, advanced networks, and remote high-end computers with the goal of enhancing the computational power accessible from local environments. Such systems promise to enable new applications in areas as diverse as smart instruments and collaborative environments. However, they also demand tools for transporting code between computers and for establishing flexible, dynamic communication structures. In this talk, we propose that these requirements can be satisfied by introducing Java classes that implement the global pointer and remote service request mechanisms defined by a communication library called Nexus. Java supports transportable code; Nexus provides communication support and represents the core communication framework for Globus, a project building infrastructure for ubiquitous supercomputing. We explain how this NexusJava library is implemented and illustrate its use with examples.
(Joint work with Ian Foster, Steven Tuecke, and Carl Kesselman)
Online paper and more information:
Abstract: Legion is a metacomputing system that will conjoin many thousands of heterogenous machines into a single, world-wide system. One of Legion's primary tenets is that maintaining the autonomy of individual sites within the larger system is of paramount importance. In such a system, the challenge of locating and allocating resources, scheduling objects for execution in accordance with multiple scheduling policies, and managing system state information is immense. This talk will describe the basic Legion system, the constituent objects used for resource management, and our framework for building resource management systems over Legion.