Energumen

Research

You can find here an overview of my research, the list of my PhD students, and a list and description of the projects I am/was involved in Overview An overview of my research work is available in my Habilitation (document in french) or in the associated slides (slides in french), defended on 12th Nov 2015 My focus is on Energy Efficiency in ICT and with ICT. I mainly focuses on HPC and large scale infrastructures (clusters, grids, clouds).

Dissemination

List of talks, tutorials, and other presentations 2022 5 July 2022 Green for IT: Table ronde Trois visions de l’informatique éco-responsable slides during Assises de la Recherche en Ingénierie, Toulouse 3 June 2022 Performance and Energy models for modern HPC servers Keynote slides during PDCO workshop of IPDPS 2022 12 May 2022 L’impact du numérique sur l’environnement slides cycle de conférences étudiantes à l’Université Toulouse III 8 April 2022 Numérique, jeux vidéo et changement climatique slides lors de la journée Reconnecter un monde dévasté ?

Publications/Code

Recent publications (2020 and later) are in my CV HAL page or directly in my HAL page Older publications (up to 2020) are in the IRIT publication database Most publication are available through Google Scholar Another way to access them is through DBLP One other way is to use ResearchGate Code MojitO/S: An open source system, energy and network monitoring tool at the O/S level Expetator: A tool for running HPC applications using several type of leverages (DVFS) and low-level monitoring (hardware performance counters, RAPL)

Poste ingénieur de recherche intégrateur d’applications et définition du processus d'intégration continu, CDD 12 mois (possibilité d'extension)

Date Début mission : entre septembre et décembre 2022. Poste à pourvoir dès que possible, les candidatures seront évaluées au fil de l’eau. Période : Année 2022 / 2023 durée 12 mois (prolongement possible) Expérience : expérience en DevOps Rémunération : en fonction du profil et de l’expérience, selon la grille indiciaire de l’Université (de 1800 à 2300 € brut mensuel en fonction de l’expérience). Lieu d’affectation : laboratoire IRIT, Université Paul Sabatier Contraintes du poste : participer à toutes les réunions du projet incluant certains déplacements potentiels

DVFS-aware performance and energy model of HPC applications

Power consumption of computers is becoming an major concern. To optimise their power consumption it is necessary to have precise information on the behavior of applications. With this information, it is possible to choose the right frequency of a processor. The speed of some applications is not really impacted by changes of this frequency, while for some application it has an important effect. The goal of this internship is to model the fine grained behavior of applications and to link this behavior with the impact (on performance and energy) of frequency changes.

Impact of processor temperature on HPC application performance and energy conusmption

Large scale datacenters manage applications as black boxes. Most of the time, they assume that application behavior is not linked to the state of the underlying hardware. When an applications runs on a hot processors, it can be slowed down arbitrary by the processor as it tries to protect itself. The goal of this internship is to evaluate the impact of temperature on the speed of the code, the impact of the execution of the code on temperature, and the possibility to reduce the frequency of the processor to cool down the processor at key points to cool down the processor (and thus speed up the application)

Performance and energy models of colocated applications

Large scale datacenters manage applications as black boxes. Most of the time, they assume that applications have no cross impact. When multiple applications are using the memory, their speed is reduces because of the bottleneck of the memory bus. In the other direction, two applications on the same core might not go at half the speed each: if one uses only floting point operations, while the other only memory access for example.

Poste ingénieur d’étude intégrateur d’applications et définition du processus d'intégration continu CDD 12 mois

L’équipe SEPIA à l’IRIT, Toulouse, recrute un ingénieur pour participer aux développements logiciels du projet Datazero2 (datazero.org) financé par l’Agence National de la Recherche (ANR). Le projet ANR-Datazero2 (2020-2023) fait suite au projet ANR-Datazero (2015-2019). En partenariat avec les laboratoires IRIT (Toulouse), LAPLACE (Toulouse), FEMTO St (Belfort- Besancon) et avec l’industriel EATON (Grenoble), il s’intéresse à l’optimisation de la gestion de centres de calcul alimentés par des sources d’énergies renouvelables.

Scheduling of malleable HPC applications

The position is offered in the framework of the French ANR-funded ENERGUMEN project and will take place at IRIT laboratory in Toulouse, France. This project aims at proposing and evaluating new scheduling heuristics for malleable/reconfigurable HPC tasks (i.e. able to change the number of resources at runtime), taking into account computing requirements but also data movement that occurs during reconfiguration. We intend to study bi-objective problems using simulation, optimizing both consumed energy and a performance criterion, e.