Technology Essays, Blogs, and Musings

Lance A. Glasser


1994 ARPA essays

Semiconductor design and manufacturing

Research papers of note


Continuous models for communication density constraints on multiprocessor performance

Lance A. Glasser and Charles A. Zukowski

© Lance A. Glasser 2007-2010

All Rights Reserved

Fundamental limits on the communication capabilities of massively parallel multiprocessors are investigated. It is shown that in the limit of machines of infinite extent in which the number of processors per unit volume is constant and in which the communication bandwidth from each processor to its neighbors depends only on their separation distance, interprocessor communication must fall off faster than the fourth power of distance. For machines of finite size, communication energy density is used as a metric to compare various machine sizes and packaging densities. For instance, for machines with spherical symmetry and uniform communication requirements, the peak density depends on the number of processors to the 4/3 power and the number of processors per unit volume to the 2/3 power.

Key works: Communication limits, information density, massive parallelism, multiprocessors.

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