fix compilation

4-GPU/HandsOn/.master/C/task6/poisson2d.solution.c

@@ -210,9 +210,6 @@ int main(int argc, char **argv) {
             printf("%dx%d: 1 GPU: %8.4f s, %d GPUs: %8.4f s, speedup: %8.2f, efficiency: %8.2f%\n",
                    ny, nx, runtime_serial, size, runtime, runtime_serial / runtime,
                    runtime_serial / (size * runtime) * 100);
-            printf(
-                "MPI time: %8.4f s, inter GPU BW: %8.2f GiB/s\n", mpi_time,
-                (iter * 4 * (ix_end - ix_start) * sizeof(real)) / (1024 * 1024 * 1024 * mpi_time));
         }
     } else {
         errors = -1;