Ultracomputer - Wikipedia

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The Ultracomputer at the Courant Institute of Mathematical Sciences Computer Science Department, developed in the 1980's, consisted of two generations of shared memory machines:^[1]^[2]^[3]

An 8 processor bus-based machine
A 16 processor, 16 memory-module machine with custom VLSI switches supporting the etch-and-Add coordination primitive. This design allows for a reduction in memory hot-spot ontention by interleaving memory addresses between the memory modules, and using the network witches to combine requests destined for the same memory location. The Ultracomputer ran symunix, a locally developed, parallel version of Unix.

References