SC is the International Conference for
High Performance Computing, Networking,
Storage and Analysis

SCHEDULE: NOV 12-18, 2011

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Avoiding hot-spots on two-level direct networks

SESSION: Optimizing Communication Performance


TIME: 4:00PM - 4:30PM

AUTHOR(S):Abhinav Bhatele, Nikhil Jain, William D. Gropp, Laxmikant V. Kale


A low-diameter, fast interconnection network is going to be a pre-requisite for building exascale machines. A two-level direct network has been proposed by several groups as a scalable design for future machines. The presence of multiple levels in this design leads to hot-spots on a few links for applications where grouping processes together is optimal for minimizing total communication volume. This is especially true for communication graphs with a small number of neighbors per task. In this paper, we explore intelligent topology aware mappings for different communication patterns on the physical topology to identify cases that minimize link utilization. We also analyze the trade-offs between using direct and indirect routing with different mappings. We use simulations to study communication and overall performance of applications on two-level direct networks since there are no installations of such networks yet. This study raises interesting issues regarding choice of job scheduling, routing and mapping.

Chair/Author Details:

Abhinav Bhatele - Lawrence Livermore National Laboratory

Nikhil Jain - University of Illinois at Urbana Champaign

William D. Gropp - University of Illinois at Urbana-Champaign

Laxmikant V. Kale - University of Illinois at Urbana-Champaign

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The full paper can be found in the ACM Digital Library

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