Exploring large profiles with calling context ring charts

Authors:
Philippe Moret;Walter Binder;Alex Villazón;Danilo Ansaloni
Affiliations:
University of Lugano, Lugano, Switzerland;University of Lugano, Lugano, Switzerland;University of Lugano, Lugano, Switzerland;University of Lugano, Lugano, Switzerland
Venue:
Proceedings of the first joint WOSP/SIPEW international conference on Performance engineering
Year:
2010

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Abstract

Calling context profiling is an important technique for analyzing the performance of object-oriented software with complex inter-procedural control flow. A common data structure is the Calling Context Tree (CCT), which stores dynamic metrics, such as CPU time, separately for each calling context. As CCTs may comprise millions of nodes, there is need for a condensed visualization that eases the location of performance bottlenecks. In this paper, we discuss Calling Context Ring Charts (CCRCs), a compact visualization for CCTs, where callee methods are represented in ring segments surrounding the caller's ring segment. In order to reveal hot methods, their callers, and callees, the ring segments can be sized according to a chosen dynamic metric. We describe a case study where CCRCs help detect and fix performance problems in an application. An evaluation confirms that our implementation efficiently handles large CCTs with millions of nodes.