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Summary: Fine-Grained Mobility in the Emerald System
Eric Jul, Henry Levy, Norman Hutchinson, and Andrew Black
Department of Computer Science
University of Washington
Seattle, WA 98195
Abstract
Emerald is an object-based language and system designed for the construction of dis-
tributed programs. An explicit goal of Emerald is support for object mobility objects in
Emerald can freely move within the system to take advantage of distribution and dynamically
changing environments. We say that Emerald has ne-grainedmobility because Emerald ob-
jects can be small data objects as well as process objects. Fine-grained mobility allows us to
apply mobility in new ways but presents implementation problems as well. This paper dis-
cusses the bene ts of ne-grained mobility, the Emerald language and run-time mechanisms
that support mobility, and techniques for implementing mobility that do not degrade the
performance of local operations. Performance measurements of the current implementation
are included.
1 Introduction
Process migration has been implemented or described as a goal of several distributed systems
19, 13, 15, 18, 7, 23, 8]. In these systems, entire address spaces are moved from node to node.
For example, a process manager might initiate a move to share processor load more evenly, or
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