UNDER construction: The agenda below is not the final one
This event is supported by INRIA, UIUC, NCSA, ANL
Main Topics | Schedule | Speaker | Affiliation | Type of presentation | Title (tentative) | Download |
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Dinner Before the Workshop | 7:30 PM | Only people registered for the dinner |
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Workshop Day 1 | Wednesday June 12th |
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| TITLES ARE TEMPORARY (except if in bold font) |
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Registration | 08:00 |
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Welcome and Introduction | 08:30 | Marc Snir + Franck Cappello | INRIA&UIUC&ANL | Background | Welcome, Workshop objectives and organization |
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| 08:45 | Thom Dunning | UIUC | Background | NCSA updates and vision of the collaboration |
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| 09:00 | Marc Snir | ANL | Background | ANL updates vision of the collaboration |
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| 09:15 | Frederic Desprez | Inria | Background | INRIA updates and vision of the collaboration |
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Big systems | 9:30 | Bill Kramer | UIUC | Background | Update on BlueWaters |
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| 10:00 | Break |
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| 10:30 | Mitsuhisa Sato | U. Tsukuba & AICS | Background | AICS and the K computer |
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| 11:00 | Paul Gibbon | Juelich | Background | TBA |
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Resilience&fault tolerance and simulation | 11:30 | Marc Snir | ANL&UIUC | Report | ICIS report on Resilience |
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| 12:00 | Lunch |
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Resilience&fault tolerance and simulation | 13:30 | Vincent Baudoui | Total & ANL | Joint-Results | TBA |
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| 14:00 | Bogdan Nicolae | IBM | Joint Result | ACM HPDC 2013 paper |
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14:30 | Martin Quison | INRIA | Result | Improving Simulations of MPI Applications Using A Hybrid Network Model with Topology and Contention Support | ||
Numerical Algorithms | 15:00 | Bill Gropp | UIUC | Background | TBA |
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| 15:30 | Break |
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16:00 | ANL | Background | TBA |
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| 16:30 | Frederic Nataf | INRIA&P6 | Background | TBA |
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| 17:00 | Luke Olson | UIUC | Background | TBA |
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| 17:30 | Marc Baboulin | INRIA | Background | Using condition numbers to assess numerical quality in high-performance computing applications |
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| 18:00 | Adjourn |
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| 19:00 | Dinner |
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Workshop Day 2 | Thursday June 13th |
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Programming Models (cont.) | 08:30 | Jean-François Mehaut | INRIA | Result | Progresses in the European FP7 Mont-Blanc 1 project and objectives of its follow up: Mont-Blanc 2 |
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| 09:00 | Rajeev Thakur | ANL | Background | TBA |
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| 09:30 | Andra Ecaterina Hugo | INRIA | Results | TBA |
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| 10:00 | Celso Mendes | UIUC | Background | TBA |
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| 10:30 | Break |
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Big Data, I/O, Visualization | 11:00 | Dries Kimpe | ANL | Results | TBA |
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| 11:30 | Gilles Fedak | INRIA | Result | TBA |
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| 12:00 | Matthieu Dorrier | INRIA | Joint Result | TBA |
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| 12:30 | Ian Foster | ANL | Background | TBA |
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| 13:00 | Lunch |
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Mini Workshop1 |
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Resilience | 14:00 | Ana Gainaru | UIUC | Results | Failure prediction on Blue Waters |
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| 14:30 | Xiang Ni | UIUC | Results | TBA |
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| 15:00 | Tatiana | INRIA & ANL | Result | TBA |
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| 15:30 | Mohamed Slim Bouguerra | INRIA & ANL | Result | TBA |
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| 16:00 | Break |
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| 16:30 | Amina Guermouche | UVSQ | Result | Multi-criteria Checkpointing Strategies: Response-time versus Resource Utilization |
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| 17:00 | Thomas Ropars | EPFL | Result | TBA |
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| 17h30 | Mehdi Diouri | INRIA | Result | ECOFIT: A Framework to Estimate Energy Consumption of Fault Tolerance Protocols for HPC Applications |
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| 18:00 | Adjourn |
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Mini Workshop2 |
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Numerical Algorithms and Libraries | 14:00 | Laura Grigori | INRIA | Result | TBA |
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| 14:30 | Stefan Wild | ANL | Result | TBA |
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| 15:00 | Frederic Hecht | INRIA/P6 | Result | TBA |
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| 15:30 | Jed Brown | ANL | Result | TBA |
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| 16:00 | Break |
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| 16:30 | Yushan Wang | INRIA P11 | Result | TBA |
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| 17:00 | Jean Utke | ANL | Result | Designing and implementing a tool-indedendent, adjoinable MPI wrapper library |
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| 17:30 | Laurent Hascoet | INRIA | Result | The adjoint of MPI one-sided communications |
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| 18:00 | Adjourn |
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| 19:00 | Banquet |
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| Lyon |
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Workshop Day 3 | Friday June 14th |
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Mini Workshop1 (cont.) |
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Resilience | 08:30 | Di Sheng | INRIA | Result | TBA |
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| 09:00 | Guillaume Aupy | INRIA | Result | TBA |
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| 09:30 | Discussion |
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| 10:00 | Break |
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Mini Workshop3 | 10:30 | Guillaume Mercier | INRIA | Result | TBA |
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Programming and Scheduling | 11:00 | Vincent Lanore | INRIA | Result | TBA |
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| 11:30 | Anne Benoit | INRIA | Result | Energy-efficient scheduling |
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| 12:00 | François Tessier | INRIA | Result | TBA |
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| 12:30 | Discussions |
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| 13:00 | Closing and Lunch |
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Mini Workshop2 (cont.) |
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Numerical Algorithms and Libraries | 08:30 | François Pellegrini | INRIA | Result | TBA |
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| 09:00 | Luc Giraud | INRIA | Result | TBA |
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| 09:30 | Discussions |
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| 10:00 | Break |
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Mini Workshop4 | 10:30 | Kate Keahey | ANL | Result | TBA |
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Clouds | 11:00 | Gabriel Antoniu | INRIA | Result | TBA |
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| 11:30 | Christian Perez | INRIA | Result | TBA |
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| 12:00 | Eddy Caron | INRIA | Result | TBA |
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| 12:30 | Discussions |
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| 13:00 | Closing and Lunch |
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Abstracts
Martin Quison
Improving Simulations of MPI Applications Using A Hybrid Network Model with Topology and Contention Support
Proper modeling of collective communications is essential for understanding the behavior of medium-to-large scale parallel applications, and even minor deviations in implementation can adversely affect the prediction of real-world performance. We propose a hybrid network model extending LogP based approaches to account for topology and contention in high-speed TCP networks. This model is validated within SMPI, an MPI implementation provided by the SimGrid simulation
toolkit. With SMPI, standard MPI applications can be compiled and run in a simulated network environment, and traces can be captured without incurring errors from tracing overheads or poor clock synchronization as in physical experiments. SMPI provides features for simulating applications that require large amounts of time or resources, including selective execution, ram folding, and off-line replay of execution traces. We validate our model by comparing traces produced by SMPI with those from other simulation platforms, as well as real world environments.
Frederic Nataf
Toward black-box adaptive domain decomposition methods
Domain decomposition methods address in a natural and powerful way modern parallel architectures. In order to be scalable, these methods involve coarse spaces. These coarse spaces are specifically designed for the two-level methods to be scalable and robust with respect to the coefficients in the equation and the choice of the decomposition. We achieve this in an automatic way by solving generalized eigenvalue problems on the interfaces between subdomains to identify the modes which slow down convergence.This construction allows for a black-box implementation. Theoretical bounds for the condition numbers of the preconditioned operators which depend only on a chosen threshold and the maximal number of neighbours of a subdomain are presented and proved. Scalable implementations on HPC platforms make it possible to solve problems with several billions of unknowns in three dimensions using FreeFem++ DSL for finite element simulations.
Marc Baboulin
Using condition numbers to assess numerical quality in high-performance computing applications
We explain how condition numbers of problems can be used to assess the quality of a computed solution. We illustrate our approach by considering the example of overdetermined linear least squares (linear systems being a special case of the latter). Our method is based on deriving exact values or estimates for the condition number of these problems. We describe algorithms and software to compute these quantities using standard parallel libraries. We present numerical experiments in a physical application and we propose performance results using new routines on top of the multicore-GPU library MAGMA.
Jean François Mehaut
Progresses in the European FP7 Mont-Blanc 1 project and objectives of its follow up: Mont-Blanc 2
Amina Guermouche
Multi-criteria Checkpointing Strategies: Response-time versus Resource Utilization
Failures are increasingly threatening the efficiency of HPC systems, and current projections of Exascale platforms indicate that rollback recovery, the most convenient method for providing fault tolerance to general-purpose applications, reaches its own limits at such scales. One of the reasons explaining this unnerving situation comes from the focus that has been given to per-application completion time, rather than to platform efficiency. In this talk, we discuss the case of uncoordinated rollback recovery where the idle time spent waiting recovering processors is used to progress a different, independent application from the system batch queue. We then propose an extended model of uncoordinated checkpointing that can discriminate between idle time and wasted computation. We instantiate this model in a simulator to demonstrate that, with this strategy, uncoordinated checkpointing per application completion time is unchanged, while it delivers near-perfect platform efficiency.
Anne Benoit
Energy-efficient scheduling
Jean Utke
Designing and implementing a tool-indedendent, adjoinable MPI wrapper library
The efficient computation of gradients by the "adjoint-mode" of algorithmic differentiation (AD) entails the inversion of MPI communication graphs. The logic to be implemented for adjoining non-blocking communication patterns is sufficiently complex to warrant a design of components that is independent of the algorithmic differentiation tool that provides the context in which the adjoint communication is to take place. We discuss (i) how we account for the different data models implied by the AD tool as well as the target language, (ii) the implementation choices among the possible adjoint communications, and (iii) the currently known limitations of our approach. We hope for feedback from the community regarding this design particularly with respect to performance and current developments in the MPI standard.
Laurent Hascoet
The adjoint of MPI one-sided communications
Computing gradients of numerical models by the adjoint mode of algorithmic differentiation is a crucial ingredient for model optimization, sensitivity analysis, and uncertainty quantification of many large-scale science and engineering applications. The adjoint mode implies a reversal of the data dependencies and consequently a reversal of communications in parallelized models. Building on previous studies regarding the adjoining of MPI two-sided communications, we investigate the construction of adjoints for certain one-sided MPI communications
Mehdi Diouri
ECOFIT: A Framework to Estimate Energy Consumption of Fault Tolerance Protocols for HPC Applications
Abstract—Energy consumption and fault tolerance are two interrelated issues to address for designing future exascale systems. Fault tolerance protocols used for checkpointing have different energy consumption depending on parameters like application features, number of processes in the execution and platform characteristics. Currently, the only way to select a protocol for a given execution is to run the application and monitor the energy consumption of different fault tolerance protocols. This is needed for any variation of the execution setting. To avoid this time and energy consuming process, we propose an energy estimation framework. It relies on an energy calibration of the considered platform and a user description of the execution setting. We evaluate the accuracy of our estimations with real applications running on a real platform with energy consumption monitoring. Results show that our estimations are highly accurate and allow selecting the best fault tolerant protocol without pre-executing the application.