SCHEDULE: NOV 15-20, 2015

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Recovering Logical Structure from Charm++ Event Traces

SESSION: Performance Tools and Models

EVENT TYPE: Papers

EVENT TAG(S): Performance

TIME: 2:30PM - 3:00PM

SESSION CHAIR(S): Kalyan Kumaran

AUTHOR(S):Katherine E. Isaacs, Abhinav Bhatele, Jonathan Lifflander, David Boehme, Todd Gamblin, Martin Schulz, Bernd Hamann, Peer-Timo Bremer

ROOM:18AB

ABSTRACT:

Asynchrony and non-determinism in Charm++ programs present a significant challenge in analyzing their event traces. We present a new framework to organize event traces of parallel programs written in Charm++. Our reorganization allows one to more easily explore and analyze such traces by providing context through logical structure. We describe several heuristics to compensate for missing dependencies between events that currently cannot be easily recorded. We introduce a new task reordering that recovers logical structure from the non-deterministic execution order. Using the logical structure, we define several metrics to help guide developers to performance problems. We demonstrate our approach through two proxy applications written in Charm++. Finally, we discuss the applicability of this framework to other task-based runtimes and provide guidelines for tracing to support this form of analysis.

Chair/Author Details:

Kalyan Kumaran (Chair) - Argonne National Laboratory|

Katherine E. Isaacs - University of California, Davis

Abhinav Bhatele - Lawrence Livermore National Laboratory

Jonathan Lifflander - University of Illinois at Urbana-Champaign

David Boehme - Lawrence Livermore National Laboratory

Todd Gamblin - Lawrence Livermore National Laboratory

Martin Schulz - Lawrence Livermore National Laboratory

Bernd Hamann - University of California, Davis

Peer-Timo Bremer - Lawrence Livermore National Laboratory

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Paper provided by the ACM Digital Library

Paper also available from IEEE Computer Society