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MPE_Seq_begin - Begins a sequential section of code.
void MPE_Seq_begin( MPI_Comm comm, int ng )
comm - Communicator to sequentialize.
ng - Number in group. This many processes are allowed to execute
at the same time. Usually one.
MPE_Seq_begin and MPE_Seq_end provide a way to force a section of code
to be executed by the processes in rank order. Typically, this is done
MPE_Seq_begin( comm, 1 );
<code to be executed sequentially>
MPE_Seq_end( comm, 1 );
Often, the sequential code contains output statements (e.g., printf )
to be executed. Note that you may need to flush the I/O buffers before
calling MPE_Seq_end ; also note that some systems do not propagate I/O
in any order to the controling terminal (in other words, even if you
flush the output, you may not get the data in the order that you want).