Scalable Comparative Visualization of Ensembles of Call Graphs

Optimizing the performance of large-scale parallel codes is critical for efficient utilization of computing resources. Code developers often explore various execution parameters, such as hardware configurations, system software choices, and application parameters, and are interested in detecting and...

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Bibliographic Details
Published in:IEEE transactions on visualization and computer graphics 2021-11, Vol.29 (3)
Main Authors: Kesavan, Suraj P., Bhatia, Harsh, Bhatele, Abhinav, Brink, Stephanie, Pearce, Olga, Gamblin, Todd, Bremer, Peer-Timo, Ma, Kwan-Liu
Format: Article
Language:English
Subjects:
coordinated and multiple views
hierarchical data
MATHEMATICS AND COMPUTING
performance analysis
software visualization
visual analytics
Online Access:Get full text
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Summary:Optimizing the performance of large-scale parallel codes is critical for efficient utilization of computing resources. Code developers often explore various execution parameters, such as hardware configurations, system software choices, and application parameters, and are interested in detecting and understanding bottlenecks in different executions. They often collect hierarchical performance profiles represented as call graphs, which combine performance metrics with their execution contexts. The crucial task of exploring multiple call graphs together is tedious and challenging because of the many structural differences in the execution contexts and significant variability in the collected performance metrics (e.g., execution runtime). In this paper, we present Ensemble CallFlow to support the exploration of ensembles of call graphs using new types of visualizations, analysis, graph operations, and features. We introduce ensemble-Sankey , a new visual design that combines the strengths of resource-flow (Sankey) and box-plot visualization techniques. Whereas the resource-flow visualization can easily and intuitively describe the graphical nature of the call graph, the box plots overlaid on the nodes of Sankey convey the performance variability within the ensemble. Our interactive visual interface provides linked views to help explore ensembles of call graphs, e.g., by facilitating the analysis of structural differences, and identifying similar or distinct call graphs. Finally, we demonstrate the effectiveness and usefulness of our design through case studies on large-scale parallel codes.
ISSN:1077-2626
1941-0506