CEA is recruiting DevOps engineers for a 2-year period to join the CExA “Moonshot” project team, which is setting up CEA’s GPU computing software stack around the Kokkos C++ library, to contribute to innovative packaging, deployment and continuous integration approaches for supercomputers, based in particular on Spack. A team of more than 10 people is currently being set up. The positions will be based at the CEA Saclay site near Paris.

To apply, please send your application (CV and covering letter) to contact@cexa-project.org. If you have any questions about the position, please use the same address. Applications will be assessed from mid-November until the position is filled.

Context

Europe is preparing for the arrival of the first exascale supercomputers, including one in France, at the CEA, from 2025. These machines will be heterogeneous, accelerated by GPUs of various vendors and architectures. Ensuring performance and portability under these conditions is undoubtedly one of the greatest challenges of Exascale. To address this, the CEA is investing heavily in an ambitious ‘Moonshot’ project: CExA. In this project, we will be providing the libraries needed to fully exploit this computing power in CEA’s scientific applications by contributing to, extending and adapting the Kokkos open-source library. The software stack created in this way will be deployed on the supercomputers using the Spack tool, which has been specially designed for supercomputing environments. Within CExA, we represent teams with expertise in numerical computation from the CEA’s four divisions.

• Maison de la Simulation (https://www.mdls.fr) of Fundamental Research division the is a joint research and engineering laboratory of the CEA, CNRS, Paris-Saclay University and Versailles Saint Quentin University specializing in high-performance computing and numerical simulation.
• The software engineering department for simulation of the Energy Research Division groups together three laboratories that address the issues of simulation environments, AI and data science, intensive computing and numerical analysis.
• LIST’s DSCIN at Technological Research Department is responsible for the research and development of digital integrated circuits and processors for AI, as well as the design of complex digital architectures. It also works on solutions for embedded systems and develops design tools for embedded AI, embedded systems and trusted circuits.
• The DSSI at Military Application Department manages and carries out activities in the fields of computing, applied mathematics and information systems, covering a broad spectrum from definition and design to user services.

Mission

As part of a new agile team being set up to carry out the CExA project, you will be working in collaboration with the French (in particular NumPEx) and European HPC ecosystem and with the teams in charge of developing Kokkos and Spack in the United States to adapt the tools to the needs of the applications developed by the CEA and to the technologies developed by Europe for Exascale (EPI, SiPearl, RISC-V).

Your mission will include:

• Supporting agile development in C++ around Kokkos by contributing to the following points:

• Implementing a testing and performance measurement strategy.
  • Designing, automating and administering continuous integration pipelines.
  • Working with development teams to optimize packaging and deployment processes.
  • Assist with deployment on heterogeneous architectures for European exaflop supercomputers.

• Identify and participate in the development of missing functionalities within the tools used for packaging and deployment and continuous integration.
• Helping to deploy Kokkos in the software environments of selected application demonstrators (hydrodynamics, fusion energy, etc.).
• Provide support and leadership on these themes within the organization and on the scale of European and global collaborations.

Skills

You have a Master’s degree and/or an engineering degree in computer science and:

• You will be able to work within an agile development process (SCRUM) and be familiar with the basic tools associated with collaborative development (Git, GitHub, etc.).
• You have software engineering skills. You are familiar with common development environments and associated tools (CMake, Docker, Spack, GoogleTest, CTest, etc.).
• Scripting skills (Python, Shell, etc.)
• Any knowledge of parallel programming (GPU, multi-threading, etc.) is a plus, particularly with the Kokkos library or equivalent.
• You have knowledge of the C++ ecosystem.
• You are a self-starter and are keen to join an international team. You have a good command of technical English (written and spoken). You are interested in the world of high-performance computing and its challenges and keep updated with the latest technological evolution.

Salary and benefits

The CEA offers competitive salaries depending on your qualifications and experience.

There are several advantages to this position:

• The possibility of joining existing collaborations with other laboratories in Europe, the United States and Japan,
• Numerous opportunities for international travel (exchanges, conferences, workshops and more),
• Up to 3 days’ teleworking per week,
• 75% reimbursement on public transport and a free transport network throughout the Ile-de-France region,
• An attractive supplementary pension scheme and several company savings plans,
• 5 weeks’ paid holiday and 4 weeks’ RTT per year.

Join the CEA’s ambitious “Moonshot” project, CExA, and contribute to the development of the Kokkos GPU computing library. We are recruiting six talented and enthusiastic C++ development engineers for a period of 2 years to work at our CEA Saclay site near Paris.

To apply, please send your application (resume and cover letter) to mathieu.lobet@cea.fr. You can use this same address for any questions concerning the offer. Applications will be evaluated from mid-May until the position is filled.

Context

Europe is investing to build exaflop supercomputers in the coming years, including one in France, at the CEA, in 2025. These machines will be heterogeneous, accelerated by GPUs of various brands and architectures. Ensuring performance and portability under these conditions is certainly one of the greatest challenges of the Exascale. To address it, CEA is investing heavily in an ambitious “Moonshot” project: CExA. In this project, we will setup libraries to fully exploit this computing power in the scientific applications of the CEA by contributing, extending and adapting the open-source library Kokkos. Within CExA, we represent teams with expertise in numerical computation from the four components of the CEA.

• Maison de la Simulation of the DRF is a joint research and engineering laboratory of CEA, CNRS, Univ. Paris-Saclay and UVSQ specialized in high performance computing and numerical simulation.
• The DES’s software engineering department for simulation brings together three laboratories that address the issues of simulation environment, AI and data science, high performance computing and numerical analysis.
• The DSCIN at DRT/LIST is responsible for the research and development of digital integrated circuits and processors for AI, as well as the design of complex digital architectures. It also works on solutions for embedded systems and develops design tools for embedded AI, embedded systems and trusted circuits.
• The DSSI of the DAM manages activities in the fields of computer science, applied mathematics and information systems, covering a wide spectrum from definition and design to user services.

Mission

As part of a new agile team being set up to carry out the CExA project, you will work in collaboration with the European HPC ecosystem and the teams in charge of the development of Kokkos in the United States (Sandia and Oakridge National labs). You will enrich the library to fit the needs of the CEA applications and to the technologies developed by Europe for the Exascale (EPI, SiPearl, RISC-V)

Your mission will include:

• Agile development in C++ of the CExA middleware to address the following areas of improvement:
  • Adaptation to “distributed memory” architectures
  • Support for heterogeneous architectures for European exaflop supercomputers
  • Interfacing with external libraries and data processing tools
  • Simplification of deployment

• Porting via Kokkos and integration of new functionalities in selected application demonstrators (hydrodynamics, fusion energy, AI-assisted medicine)
• Support and animation on parallel programming models within the laboratory and at the scale of European and global collaborations.

Skills

You have a master and/or an engineering degree in computer science and:

• You have a solid knowledge of advanced C++ and the latest standards.
• You know how to fit into an agile development process (SCRUM) and you master the basic tools associated with collaborative development (git, github, etc.).
• You have skills in software engineering. You are familiar with common development environments and associated tools (cmake, docker, spack, gtest, ctest, etc.).
• Knowledge of parallel programming (GPU, multi-threaded, etc.) is a plus, especially with the Kokkos library or equivalent.
• You are autonomous and you wish to be part of an international work team. You master technical English (written and oral). You are interested in the world of high-performance computing and its challenges and follow the evolution of technologies.

Salary and benefits

The CEA offers salaries based on your degrees and experience.

This position offers several advantages:

• the possibility to join collaborations with other European laboratories, the United States and Japan,
• Numerous opportunities to travel internationally (exchanges, conferences, workshops and more)
• Up to 3 days of telecommuting per week
• Reimbursement of up to 75% of public transport cards and a free transport network throughout the Ile-de-France region,
• An interesting complementary health insurance and several company savings plans,
• 5 weeks of paid vacation and 4 weeks of RTT per year.