Level-1 Access

• Similar to level 0, but each process uses collective I/O functions

MPI_File_open(MPI_COMM_WORLD, file, ..., &fh);

for (i=0; i<n_local_rows; i++) {

MPI_File_seek(fh, ...);

MPI_File_read_all(fh, &(A[i][0]), ...);

}

MPI_File_close(&fh);

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