Amarpal Singh Kapoor <[email protected]> writes:

Hello All,

I intend to solve a Finite Element problem using MPI and PETSc. I have a conceptual problem with reading a mesh file in parallel with MPI IO.

The mpi-forum list is for discussions regarding the MPI standardization process, not for general usage questions. Please move this discussion back to the PETSc mailing list or try [email protected] if the question is specifically about MPI-IO.

Unlike in the figure above I have a file which is different in structure (i.e. formatted with blocks of different size and datatypes) and I don't get how different blocks of data can be read in parallel. Should there be a synchronization call like MPI_BARRIER, after every block is completed on all processors?

No, but you need to compute offsets for the parts to be read by each process.