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Abstract - Technical Program - OSDI 99
The Coign Automatic Distributed Partitioning System
Galen C. Hunt, Microsoft Research
Michael L. Scott, University of Rochester
Abstract
Although successive generations of middleware (such as RPC, CORBA, and
DCOM) have made it easier to connect distributed programs, the process
of distributed application decomposition has changed little:
programmers manually divide applications into sub-programs and
manually assign those sub-programs to machines. Often the techniques
used to choose a distribution are ad hoc and create one-time solutions
biased to a specific combination of users, machines, and networks.
We assert that system software, not the programmer, should manage
the task of distributed decomposition. To validate our assertion we
present Coign, an automatic distributed partitioning system that
significantly eases the development of distributed applications.
Given an application (in binary form) built from distributable COM
components, Coign constructs a graph model of the application's
inter-component communication through scenario-based profiling. Later,
Coign applies a graph-cutting algorithm to partition the application
across a network and minimize execution delay due to network
communication. Using Coign, even an end user (without access to source
code) can transform a non-distributed application into an optimized,
distributed application. Coign has automatically distributed
binaries from over 2 million lines of application code, including
Microsoft's PhotoDraw 2000 image processor. To our knowledge, Coign is
the first system to automatically partition and distribute binary
applications.
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Technical Program