How to write in parallel

[zhyxue0]

Hi, everyone. I'm trying to solve poisson's equation in parallel(mpiexec -n 4 python poisson_mixed.py), the code File("poisson_mixed.pvd").write(u) seems to be the same as the serial version. I want to write solution u to txt file under parallel version, but the code np.savetxt(file_name, u.dat.data) will write repeatedly on different processors. How to implement it in parallel?

[wence-]

[I moved this to a discussion since I think that's probably a better place for it]

What would you like to do with the text file after you write it? Just writing the coefficients loses a lot of information, especially in parallel where the distribution of the mesh between processes is not known.

If you need this for checkpointing, consider using CheckpointFile which is designed for this purpose.

[zhyxue0]

Thanks. I just want to prevent the program from crashing during running.