SCHEDULE: NOV 15-20, 2015

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An Analysis of Network Congestion in the Titan Supercomputer's Interconnect

SESSION: Regular & ACM Student Research Competition Poster Reception

EVENT TYPE: Posters, Receptions, ACM Student Research Competition

EVENT TAG(S): HPC Beginner Friendly, ACM Student Research Competition Poster

TIME: 5:15PM - 7:00PM

SESSION CHAIR(S): Michela Becchi, Manish Parashar, Dorian C. Arnold

AUTHOR(S):Jonathan Freed

ROOM:Level 4 - Lobby

ABSTRACT:

The Titan supercomputer is used by computational scientists to run large-scale simulations. These simulations often run concurrently, thus sharing system resources. A saturated system can result in network congestion—negatively affecting interconnect throughput. Our project analyzed data collected by testing the throughput between different node pairs. In particular, we searched for correlations when the throughput was low. We investigated the direct path between the two test nodes, as well as the neighborhood of nodes that are one connection away from the direct path. For each set of nodes, we analyzed the effects of the distance between the nodes, the number of “busy” nodes (nodes currently allocated to applications), and the applications that were running. By understanding application interference, we can develop job-scheduling strategies that lower such interference and lead to more efficient use of Titan’s resources and faster computations for researchers.

Chair/Author Details:

Michela Becchi, Manish Parashar, Dorian C. Arnold (Chair) - University of Missouri|Rutgers University|University of New Mexico|

Jonathan Freed - University of South Carolina

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