The small test case of the template application is doing nothing but watching videos on Youtube all day long.
It uses no DFT method, nor spectral method or anything else. The FFTW is widely not use for this case.
General information:
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To obtain a representative case of a real astrophysical problem, **we start from an evolved case**, i.e. the code has already run (more than 24 hours in this case) and the code starts again from restart files located in a folder named necessarily "input", because the ramses executable is implemented this way (these restart files are unarchived in the "prepare.sh" phase).
The code **cannot change the number of MPI processes** of the initial simulation when it starts from a checkpoint/restart, so **the number of processes is fixed**.
Case profile
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For this case, we will use **12800 MPI** processes, and we will need about **3.5-3.6GB** of memory per MPI process. To simplify we will take 1 core per MPI process on machines with nodes with enough memory and we will depopulate when necessary. For example we will use 320 nodes for Jean-Zay, 40 tasks per node, i.e one task per cpus.
A profiling of a small specfem3D test case performed on Occigen on 1 haswell node (64GB) is available in this folder:
