Serial versus Parallel Output

According to the ouptput mode parameter settings (IO::out_mode, IO::out_unchunked,
IO::out_proc_every) of thorn IOUtil, thorn IOHDF5 will output distributed data either

• in serial into a single unchunked file

    IO::out_mode      = "onefile"
    IO::out_unchunked = "yes"
  

• in parallel, that is, into separate files containing chunks of the individual processors' patches of the distributed array

    IO::out_mode      = "proc|np"
  

The default is to output data in parallel, in order to get maximum I/O performance. If needed, you can recombine the resulting chunked datafiles into a single unchunked file using the recombiner utility program. See section J2.10 for information how to build the recombiner program.