Add timing for file IO

BasicSolver/3D-mpi-io/src/main.c

@@ -73,11 +73,17 @@ int main(int argc, char** argv)
         printf("Solution took %.2fs\n", timeStop - timeStart);
     }
 
+    timeStart       = getTimeStamp();
     VtkOptions opts = { .grid = s.grid, .comm = s.comm };
     vtkOpen(&opts, s.problem);
     vtkScalar(&opts, "pressure", s.p);
     vtkVector(&opts, "velocity", (VtkVector) { s.u, s.v, s.w });
     vtkClose(&opts);
+    timeStop = getTimeStamp();
+
+    if (commIsMaster(&s.comm)) {
+        printf("Result output took %.2fs\n", timeStop - timeStart);
+    }
 
     commFinalize(&s.comm);
     return EXIT_SUCCESS;