In this chapter, we saw how to execute copies of the same script on different processors in parallel. Message passing allows the communication between these different processes. We saw point-to-point communication and the two different distribution type collective communications one-to-all and all-to-one. The commands presented in this chapter are provided by the Python module mpi4py, which is a Python wrapper to realize the MPI standard in C.
Having worked through this chapter, you are now able to work on your own scripts for parallel programming and you will find that we described only the most essential commands and concepts here. Grouping processes and tagging information are only two of those concepts that we left out. Many of these concepts are important for special and challenging applications, which are far too particular for this introduction.
