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MPE_Seq_begin

NAME

MPE_Seq_begin - Begins a sequential section of code.

SYNOPSIS

 void MPE_Seq_begin( MPI_Comm comm, int ng )
 

INPUT PARAMETERS

comm

- Communicator to sequentialize.

ng

- Number in group. This many processes are allowed to execute at the same time. Usually one.

NOTES

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).

LOCATION

mpe_seq.c