Modern supercomputers with multi-core nodes enhanced by accelerators, as well as hybrid programming models introduce more complexity in modern applications. Exploiting efficiently all the resources requires a complex analysis of the performance of applications in order to detect time-consuming sections. We present EZTRACE, a generic trace generation framework that aims at providing a simple way to analyze applications. EZTRACE is based on plugins that allow it to trace different programming models such as MPI, pthread or OpenMP as well as user-defined libraries or applications. EZTRACE uses two steps: one to collect the basic information during execution and one post-mortem analysis. This permits tracing the execution of applications with low overhead while allowing to refine the analysis after the execution. We also present a script language for EZTRACE that gives the user the opportunity to easily define the functions to instrument without modifying the source code of the application.

Abstract. High-performance computing relies more and more on complex hardware: multiple computers, multi-processor computer, multi-core processing unit, multiple general purpose graphical processing units... To efficiently exploit the power of current computing architectures, modern applications rely on a high level of parallelism. To analyze and optimize these applications, tracking the software behavior with minimum impact on the software is necessary to extract time consumption of code sections as well as resource usage (e.g., network messages). In this paper, we present a method for instrumenting functions in a binary application. This method permits to collect data at the entry and the exit of a function, allowing to analyze the execution of an application. We implemented this mechanism in EZTrace 4 and the evaluation shows a significant improvement compared to other tools for instrumentation.

Cet article résume le travail effectué durant le projet Colargol pendant le CEMRACS 2012. Le but de ce projet est de comparer les implémentations de méthodes d'éléments finis d'ordré elevé pour les fluides compressibles devéloppéesà l'ONERA età l'INRIA depuis environ un an dans les bibliothèques Aghora et Aerosol.