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On generalized fat trees

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4 Author(s)
Ohring, S.R. ; Dept. of Comput. Sci., North Texas Univ., Denton, TX, USA ; Ibel, M. ; Das, S.K. ; Kumar, M.J.

We introduce and analyze a new family of multiprocesser interconnection networks, called generalized fat trees, which include as special cases the fat trees used for the connection machine architecture CM-5, pruned butterflies, and various other fat trees proposed in the literature. The generalized fat trees provide a formal unifying concept to design and analyse a fat tree based architecture. The extended generalized fat tree network XGFT(h; m1, ..., mh; w1, ..., wh) of height h has Πi=1 h mi leaf processors and the inner nodes serve only as switches or routers. Each non-leaf node in level i has mi children and each non-root has wi+1 parent nodes. The generalized fat trees provide regularity, symmetry, recursive scalability, maximal fault-tolerance, logarithmic diameter bisection scalability, and permit simple algorithms for fault tolerant self-routing and broadcasting. These networks are also versatile, since they can efficiently embed rings, meshes and tori, trees, pyramids and hypercubes

Published in:

Parallel Processing Symposium, 1995. Proceedings., 9th International

Date of Conference:

25-28 Apr 1995

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