Visualizing Hierarchical Performance Profiles of Parallel Codes using CallFlow. - Interface Demo.
Abstract: Calling context trees (CCTs) couple performance metrics with call paths, helping understand the execution and performance of parallel programs. To identify performance bottlenecks, programmers and performance analysts visually explore CCTs to form and validate hypotheses regarding degraded performance. However, due to the complexity of parallel programs, existing visual representations do not scale to applications running on a large number of processors. We present CALLFLOW, an interactive visual analysis tool that provides a high-level overview of CCTs together with semantic refinement operations to progressively explore the CCTs. Using a flow-based metaphor, we visualize a CCT by treating execution time as a resource spent during a call chain, and demonstrate the effectiveness of our design with case studies on large-scale, production simulation codes.
Published in IEEE Transactions on Visualization and Computer Graphics, 2019.