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Title:Speeding-up graph processing on shared-memory platforms by optimizing scheduling and compute
Author(s):Heidarshenas, Azin
Director of Research:Torrellas, Josep
Doctoral Committee Chair(s):Torrellas, Josep
Doctoral Committee Member(s):Chen, Deming; Hwu, Wen-mei; Kumar, Rakesh; Misailovic, Sasa; Morrison, Adam
Department / Program:Electrical & Computer Eng
Discipline:Electrical & Computer Engr
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Shared-memory platforms
graph processing
approximate computation
dynamic graphs
Abstract:Graph processing workloads are being widely used in many domains such as computational biology, social network analysis, and financial analysis. As DRAM technology scales down into higher densities, shared-memory platforms gain increasing importance in handling large graph sizes. We study two main categories of graph algorithms from an implementation perspective. Topology-driven algorithms process all vertices of the graph at each iteration, while data-driven algorithms only process those vertices that make a substantial contribution to the output. Furthermore, the performance of a graph algorithm execution can be broken down into three components, namely, pre-processing, compute, and scheduling. For data-driven algorithms, the work of each thread is driven by the dependencies between vertex values that are known only at run-time. Hence, the scheduling will take a significant portion of execution. However, for topology-driven algorithms, the scheduling time is negligible since the work of each thread can be determined at compile-time. In this dissertation, we present three techniques to address the performance bottlenecks in both data-driven and topology-driven algorithms. First, we present Snug, which is a chip-level architecture that mitigates the trade-off between synchronization and wasted work in data-driven algorithms. Second, we present V-Combiner, which is a software-only technique to mitigate the trade-off between performance and accuracy of topology-driven algorithms using novel vertex-merging and recovery mechanisms. Finally, we present KeepCompressed, which is a set of algorithms to speed-up compute for topology-driven algorithms using vertex clustering for dynamic graphs.
Issue Date:2021-12-02
Rights Information:Copyright 2021 Azin Heidarshenas
Date Available in IDEALS:2022-04-29
Date Deposited:2021-12

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