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Practical Differential Profiling

  • Martin Schulz
  • Bronis R. de Supinski
Part of the Lecture Notes in Computer Science book series (LNCS, volume 4641)

Abstract

Comparing performance profiles from two runs is an essential performance analysis step that users routinely perform. In this work we present eGprof, a tool that facilitates these comparisons through differential profiling inside gprof. We chose this approach, rather than designing a new tool, since gprof is one of the few performance analysis tools accepted and used by a large community of users.

eGprof allows users to ”subtract” two performance profiles directly. It also includes callgraph visualization to highlight the differences in graphical form. Along with the design of this tool, we present several case studies that show how eGprof can be used to find and to study the differences of two application executions quickly and hence can aid the user in this most common step in performance analysis. We do this without requiring major changes on the side of the user, the most important factor in guaranteeing the adoption of our tool by code teams.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2007

Authors and Affiliations

  • Martin Schulz
    • 1
  • Bronis R. de Supinski
    • 1
  1. 1.Center for Applied Scientific Computing, Lawrence Livermore National Laboratory, PO Box 808, L-560, Livermore, CA 94551USA

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