Action Exploratoire INRIA ExODE

Coordinateur: Jonathan Rouzaud-Cornabas (INRIA Beagle, Liris)

Participants: Samuel Bernard (INRIA Dracula, Institut Camille Jordan), Thierry Gautier (Avalon)

Date: 2019-2022

En Français:
En biologie, la grande majorité des systèmes peut être modélisée sous la forme d’équations différentielles ordinaires (ODE). Modéliser plus finement des objets biologiques mène à augmenter le nombre d’équations. Simuler des systèmes toujours plus grands mène également à augmenter le nombre d’équations. Par conséquent, nous observons une explosion de la taille des systèmes d’ODE à résoudre. Un verrou majeur est la limitation des logiciels de résolutions numériques d’ODE (solveur ODE) à quelques milliers d’équations à cause de temps de calcul prohibitif. L’AEx ExODE s’attaque à ce verrou via 1) l’introduction de nouvelles méthodes numériques qui tireront parti de la précision mixte qui mélange plusieurs précisions de nombre flottant au sein d’un schéma de calcul, 2) l’adaptation de ces nouvelles méthodes pour des machines de calcul de prochaines générations qui sont fortement hiérarchiques et hétérogénes et composées d’un grand nombre de CPUs et GPUs. Depuis un an, une nouvelle approche du Deep Learning se propose de remplacer les Recurrent Neural Network (RNN) par des systèmes d’ODE. Les méthodes numériques et parallèles d’ExODE seront évalué et adapté dans ce cadre afin de permettre l’amélioration de la performance et de l’exactitude de ces nouvelles approches.

En Anglais:
In biology, the vast majority of systems can be modeled as ordinary differential equations (ODEs). Modeling more finely biological objects leads to increase the number of equations. Simulating ever larger systems also leads to increasing the number of equations. Therefore, we observe a large increase in the size of the ODE systems to be solved. A major lock is the limitation of ODE numerical resolution software (ODE solver) to a few thousand equations due to prohibitive calculation time. The AEx ExODE tackles this lock via 1) the introduction of new numerical methods that will take advantage of the mixed precision that mixes several floating number precisions within numerical methods, 2) the adaptation of these new methods for next generation highly hierarchical and heterogeneous computers composed of a large number of CPUs and GPUs. For the past year, a new approach to Deep Learning has been proposed to replace the Recurrent Neural Network (RNN) with ODE systems. The numerical and parallel methods of ExODE will be evaluated and adapted in this framework in order to improve the performance and accuracy of these new approaches.

Inria Project Lab Discovery

Distributed and COoperative management of Virtual Environments autonomousLY

The DISCOVERY initiative aims at exploring a new way of operating Utility Computing (UC) resources.

To accommodate the ever-increasing demand for Utility Computing (UC) resources, while taking into account both energy and economical issues, the current trend consists in building larger and larger data centers in a few strategic locations. Although such an approach enables UC providers to cope with the actual demand while continuing to operate UC resources through centralized software system, it is far from delivering sustainable and efficient UC infrastructures. We claim that a disruptive change in UC infrastructures is required: UC resources should be managed differently, considering locality as a primary concern. To this aim, we propose to leverage any facilities available through the Internet in order to deliver widely distributed UC platforms that can better match the geographical dispersal of users as well as the unending demand. Critical to the emergence of such locality-based UC (LUC) platforms is the availability of appropriate operating mechanisms. We advocate the implementation of a unified system driving the use of resources at an unprecedented scale by turning a complex and diverse infrastructure into a collection of abstracted computing facilities that is both easy to operate and reliable.

Start Date: January 2015

Duration: 4 years

Avalon Members: J. Darrous, G. Fedak, C. Perez

More information on Discovery website

Inria Project Lab C2S@Exa

Computer and Computational Sciences at Exascale INRIA Large Scale Initiative

The C2S@Exa INRIA large-scale initiative is concerned with the development of numerical modeling methodologies that fully exploit the processing capabilities of modern massively parallel architectures in the context of a number of selected applications related to important scientific and technological challenges for the quality and the security of life in our society. Avalon is a core-team member, co-leading Pole 4 on Programming models.

Start Date: 2013

Duration: 4 years

Avalon Members: T. Gautier, C. Perez, J. Richard

More information on C2S@Exa website

Inria Project Lab HAC-SPECIS

HAC SPECIS: Inria project lab on High-performance Application and Computers: Studying PErformance and Correctness In Simulation (2016-2020) :

The goal of the HAC SPECIS (High-performance Application and Computers: Studying PErformance and Correctness In Simulation) project is to answer  methodological needs of HPC application and runtime developers and to allow to study real HPC systems both from the correctness and performance point of view. To this end, we gather experts from the HPC, formal verification and performance evaluation community. website : http://hacspecis.gforge.inria.fr/

 

Start Date: June 2016

Duration: 4 years

Avalon Members: F. Suter, L. Lefevre

INRIA Project Lab Héméra

French Project around the Grid’5000 testbed.

INRIA Project Lab Héméra

Héméra was an INRIA Large Scale Initiative (2010-2014), that aimed at demonstrating ambitious up-scaling techniques for large scale distributed computing by carrying out several dimensioning experiments on the Grid’5000 infrastructure, at animating the scientific community around Grid’5000 and at enlarging the Grid’5000 community by helping newcomers to make use of Grid’5000.

More information on Hemera website