[Trilinos-Users] Epetra_MpiComm::Barrier(): how to synchronize more than once?

[Joachim Wuttke]

 From the docs:
Epetra_MpiComm::Barrier() causes each processor in the
communicator to wait until all processors have arrived.

Empirical finding:
Must be called only once.

So this works:

   MPI_Init(..)
   Epetra_MpiComm Comm( MPI_COMM_WORLD );
   ..
   Comm.Barrier();
   ..
   MPI_Finalize();

But not:

   MPI_Init(..)
   Epetra_MpiComm Comm( MPI_COMM_WORLD );
   ..
   Comm.Barrier(); # mark 1
   ..
   Comm.Barrier(); # mark 2
   ..
   MPI_Finalize();

Empirically, I find that processors will not
wait until all processors have arrived at mark #2.

How to enforce the desired behavior?

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