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DOE OSTI · 1241972

Evaluating System Parameters on a Dragonfly using Simulation and Visualization

Bhatele, Abhinav·Jain, Nikhil·Livnat, Yarden·Pascucci, Valerio·Bremer, Peer-Timo
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Abstract

The dragon y topology is becoming a popular choice for build- ing high-radix, low-diameter networks with high-bandwidth links. Even with a powerful network, preliminary experi- ments on Edison at NERSC have shown that for communica- tion heavy applications, job interference and thus presumably job placement remains an important factor. In this paper, we explore the e ects of job placement, job sizes, parallel workloads and network con gurations on network through- put to better understand inter-job interference. We use a simulation tool called Damsel y to model the network be- havior of Edison and study the impact of various system parameters on network throughput. Parallel workloads based on ve representative communication patters are used and the simulation studies on up to 131,072 cores are aided by a new visualization of the dragon y network.

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Bhatele, Abhinav, Jain, Nikhil, Livnat, Yarden, Pascucci, Valerio, Bremer, Peer-Timo. 2015-04-24. Evaluating System Parameters on a Dragonfly using Simulation and Visualization. https://doi.org/10.2172/1241972

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