sid=sion_paropen_mpi( ... ,&chunksize, comm, &fileptr, ...) # collective

while((!sion_feof(sid))) {                                  # non-collective
      btoread=sion_bytes_avail_in_block(sid);               # non-collective
      bread=fread(localbuffer,1,btoread,fileptr);     
}             

sion_parclose_mpi(sid);                                     # collective
