Large transfers in ROMIO
Let’s say you had a fat node with lots of memory, and you wanted to write 2 GiB of data out to a file with MPI-IO. How would you do that? You would naturally look at MPI_File_write() or one of its variants. This is the prototype for MPI_File_write_all: int MPI_File_write_all(MPI_File fh, const void *buf, int …