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
with
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).
mpe_seq.c