Deciding how to handle this is part of the point of the project. You need to weigh the pros and cons of each approach and justify which you have chosen in your report. Broadly, you have two options: - You generate the matrix only at the root process. This may make your code simpler, e.g. implementing writing the matrix to a file is trivial (writing does not have to be done in parallel), but your other processes will be sitting idle until you finished generating the matrices. - You can generate parts of the matrix in different processes. You may have to design your program more carefully, but your worker processes won't be sitting idle while a single process generates the matrix.