Initial

uebung_04/exercise_05/exercise_05.c

@@ -0,0 +1,33 @@
+#include "mpi.h"
+#include <stdio.h>
+
+int main(int argc, char **argv) {
+  int rank, size, err, n, sum;
+
+  MPI_Init(&argc, &argv);
+
+  MPI_Comm_size(MPI_COMM_WORLD, &size);
+  MPI_Comm_rank(MPI_COMM_WORLD, &rank);
+
+  printf("rank=%d size=%d\n", rank, size);
+
+  n = rank + 1;
+
+  sum = 4710;
+
+  MPI_Barrier(MPI_COMM_WORLD);
+
+  MPI_Reduce(&n, &sum, 1, MPI_INT, MPI_SUM, 0, MPI_COMM_WORLD);
+  printf("Received in reduction=%d\n", sum);
+
+  MPI_Barrier(MPI_COMM_WORLD);
+
+  sum = 3710;
+
+  MPI_Allreduce(&n, &sum, 1, MPI_INT, MPI_SUM, MPI_COMM_WORLD);
+  printf("Received in allreduction =%d\n", sum);
+
+  MPI_Finalize();
+
+  return 0;
+}