SCHEDULE: NOV 15-20, 2015

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Cost-Effective Diameter-Two Topologies: Analysis and Evaluation

SESSION: Interconnection Networks

EVENT TYPE: Papers

EVENT TAG(S): Architectures, Networks

TIME: 11:00AM - 11:30AM

SESSION CHAIR(S): Ilya Baldin

AUTHOR(S):Georgios Kathareios, Cyriel Minkenberg, Bogdan Prisacari, German Rodriguez, Torsten Hoefler

ROOM:18CD

ABSTRACT:

HPC network topology design is currently shifting from high-performance,
higher-cost Fat-Trees to more cost-effective architectures. Three diameter-two
designs, the Slim Fly, Multi-Layer Full-Mesh, and Two-Level Orthogonal Fat-Tree
excel in this, exhibiting a cost per endpoint of only 2 links and 3 router ports
with lower end-to-end latency and higher scalability than traditional networks
of the same total cost. However, other than for the Slim Fly, there is currently
no clear understanding of the performance and routing of these emerging
topologies. For each network, we discuss minimal, indirect random, and adaptive
routing algorithms along with deadlock-avoidance mechanisms. Using these, we
evaluate the performance of a series of representative workloads, from global
uniform and worst-case traffic to the all-to-all and near-neighbor exchange
patterns prevalent in HPC applications. We show that while all three topologies
have similar performance, OFTs scale to twice as many endpoints at the same cost
as the others.

Chair/Author Details:

Ilya Baldin (Chair) - RENCI|

Georgios Kathareios - IBM Corporation

Cyriel Minkenberg - IBM Corporation

Bogdan Prisacari - IBM Corporation

German Rodriguez - IBM Corporation

Torsten Hoefler - ETH Zurich

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Paper provided by the ACM Digital Library

Paper also available from IEEE Computer Society