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Question 8: You develop a parallel application that will be deployed on a Windows HPC Server 2008 cluster.The application uses point-to-point communication.
The process that has a rank 0 sends an array of integer values to the rank 1 process by using the
following code segment. (Line numbers are included for reference only.)
01 int values[5];
02 MPI_Send(values, 5, MPI_INT, 1, 42,
03 MPI_COMM_WORLD);
You need to ensure that each receiving process is able to correctly receive the values in the most efficient
manner possible.
Which code segment should you use?
A. int values[5];
int buffer[5];
MPI_Reduce(buffer, values, 5, MPI_INT, MPI_SUM, 1, MPI_COMM_WORLD);
B. int values[5];
MPI_Status status;
MPI_Recv(values, 5, MPI_INT, 0, 42, MPI_COMM_WORLD, &status);
C. int value;
MPI_Status status;
MPI_Recv(&value, 1, MPI_INT, 0, 42, MPI_COMM_WORLD, &status);
D. int values[5];
MPI_Status status;
MPI_Recv(values, sizeof(int), MPI_INT, 0, 42, MPI_COMM_WORLD, &status);
Correct Answer: B
