Step-6: Advanced PFASST controllers

We discuss controller implementations, features and parallelization of PFASST controllers in this step.

• Part A: The non-MPI controller. SDC, and MLSDC and PFASST on 1, 2, 4 and 8 processes, emulated in one process.

• Part B: Odd temporal distribution. 3, 5, 7 and 9 processes for 8 time steps.

• Part C: MPI parallelization. The same with controller_MPI, one step per MPI rank, and the check that it gives the same results.

Each part is a Python script in jupytext “percent” format: run it with python (Part C with mpirun), open it as a notebook in Jupyter, or read it on the website, where Parts A and B are executed with every build. pfasst_setup.py holds the setup all three share.