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SCHEDULE: NOV 16-21, 2014
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Faster Parallel Traversal of Scale Free Graphs at Extreme Scale with Vertex Delegates
SESSION: Graph Algorithms
EVENT TYPE: Papers
TIME: 1:30PM - 2:00PM
SESSION CHAIR: Felix Wolf
AUTHOR(S):Roger Pearce, Maya Gokhale, Nancy M. Amato
ROOM:388-89-90
ABSTRACT:
At extreme scale, irregularities in the structure of scale-free graphs such as social network graphs limit our ability to analyze these important and growing datasets. A key challenge is the presence of high-degree vertices, that leads to parallel workload and storage imbalances. We present techniques to distribute storage, computation, and communication of hubs for extreme scale graphs in distributed memory supercomputers. To balance the hub processing workload, we distribute hub data structures and related computation among a set of delegates. The delegates coordinate using highly optimized asynchronous broadcast and reduction operations. We demonstrate scalability of our new algorithmic technique using Breadth-First Search (BFS), Single Source Shortest Path (SSSP), K-Core Decomposition, and Page-Rank on synthetically generated scale-free graphs. Our results show excellent scalability on large scale-free graphs up to 131K cores of the IBM BG/P, and outperform the best known Graph500 performance on BG/P Intrepid by 15%.
Chair/Author Details:
Felix Wolf (Chair) - German Research School for Simulation Sciences
Roger Pearce - Lawrence Livermore National Laboratory
Maya Gokhale - Lawrence Livermore National Laboratory
Nancy M. Amato - Texas A&M University
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