Abstract of TOKAPROF Project

Edge turbulent transport is one of the key issues of magnetized fusion research. It determines both the performances of the tokamak, via its role in the building of the H-mode transport barrier, and the life expectancy of plasma facing components, via the particle and heat fluxes reaching the solid materials of the reactor wall. Benefiting from the steady increase of the available computing power, the current international effort is progressively shifting towards developing 3D fluid turbulence codes able to describe self-consistently turbulent transport in realistic geometry.

The TOKAM3X is currently being developed and used as part of this effort. Hybrid MPI+OpenMP parallelization is used to take advantage of the characteristics of large nodes machines currently available. The code has recently reached a stage of its development where a first stable version exists and has been applied to simple physical cases. More complex cases in more realistic geometry will require the use of finer meshes at the cost of a strong increase in computing time. Optimizing the performance of the code will greatly improve the accessibility of these complex cases.

The aim of the current project is to perform a complete profiling of the current version of the code. Both sequential and parallel (MPI and OpenMP) profiling are needed. The expected output is the identification of bottlenecks and most promising sources of optimization. This will be a key guideline in developing the code.