ex3: task 2

exercise3/wave_1d_parallel.c

@@ -160,7 +160,17 @@ int main(int argc, char **argv) {
   // TASK: T2
   // Time your code
   // BEGIN: T2
+  if (comm_rank == ROOT)
+    gettimeofday(&t_start, NULL);
   simulate();
+  MPI_Barrier(MPI_COMM_WORLD);
+
+  if (comm_rank == ROOT) {
+    gettimeofday(&t_end, NULL);
+
+    printf("Total elapsed time: %lf seconds\n",
+           WALLTIME(t_end) - WALLTIME(t_start));
+  }
   // END: T2
 
   domain_finalize();