Phd Position F - M Mesh Partitioning For High Performance Solvers on Exascale Computing Systems H/F INRIA

PhD Position F/M Mesh partitioning for high performance solvers on Exascale computing systems
Le descriptif de l'offre ci-dessous est en Anglais
Type de contrat : CDD

Niveau de diplôme exigé : Bac +5 ou équivalent

Fonction : Doctorant

Niveau d'expérience souhaité : Jeune diplômé

A propos du centre ou de la direction fonctionnelle

The Inria research centre in Lyon is the 9th Inria research centre, formally created in January 2022. It brings together approximately 410 people in 20 research teams and research support services.

Its staff are distributed in Villeurbanne, Lyon Gerland, and Saint-Etienne.

The Lyon centre is active in the fields of software, distributed and high-performance computing, embedded systems, quantum computing and privacy in the digital world, but also in digital health and computational biology.

Contexte et atouts du poste

This PhD will be part of the Horizon Europe HORIZON-JU-EUROHPC-2026-COE-LH-01-03 FEniCS Lighthouse project, which is fully funded and will start in January 2027. The other international partners of the project are Simula Research Laboratory, Norway; University of Cambridge Cambridge, United Kingdom; University College London, United Kingdom; University of Luxembourg, Luxembourg; Koç University, Türkiye; Sabancı University, Türkiye. The PhD will work closely with the researchers in this project.

Mission confiée

Real-world applications of finite element mesh (FEM) simulations require parallel computing.In such a setting, computational meshes must be partitioned among multiple computers as a first step. One important goal of mesh partitioning is to keep the resulting inter-process communication overhead low while achieving load balance. Failing to do so will lead to parallel FEM simulations which do not scale. The current state-of-the-art and mainstream approaches treat mesh partitioning as a graph or hypergraph partitioning problem, which is then tackled with well-known libraries. The common goal of these libraries is to minimize the total volume of inter-process communication. However, thisdoes not accurately reflect the inter-process communication cost in the current systems. This mismatch is exacerbated specifically on today's strongly hierarchical HPC topologies, which have highly variable inter-process communication cost. The current mesh partitioner needs major improvements to incorporate the proper objectives in its underlying optimization procedures, and thus achieve scalable finite element computations on current and future supercomputers. This PhD will work to develop a novelapproach to mesh/graph/hypergraph partitioning by adopting an optimization objective that truly reflects the actual communication overhead.

Principales activités

The PhD will design, analyze, and implement algorithms for mesh partitioning and collaborate with the project partners to make use of it in the open source FEniCS framework https://fenicsproject.org.

Compétences

Technical Skills:

- Programming: Proficiency in C++, Python; experience with parallel programming models (MPI, OpenMP, or GPU acceleration) is a plus.
- Graph/Hypergraph Partitioning: Knowledge of libraries like METIS, ParMETIS, SCOTCH, KaHIP, or Zoltan, and is a plus.
- FEM Frameworks: Familiarity with FEniCS or deal.IIis a plus.
- Experience with supercomputing environments.

Collaboration skills: Ability to work in a multi-institutional, interdisciplinary team (academia + research labs).

Communication skills: Clear technical writing and presentation skills (for papers, reports, and open-source documentation).

Avantages

- Subsidized meals
- Partial reimbursement of public transport costs
- Leave: 7 weeks of annual leave + 10 extra days off due to RTT (statutory reduction in working hours) + possibility of exceptional leave (sick children, moving home, etc.)
- Possibility of teleworking (90 days / year) and flexible organization of working hours
- Social, cultural and sports events and activities
- Access to vocational training
- Social security coverage

Rémunération

1st, 2nd and 3rd year: 2300 euros gross salary /month