Performance counter stats for 'du -s -x /' (10 runs):

       1737.943072      task-clock (msec)         #    0.996 CPUs utilized            ( +-  2.83% )
               540      context-switches          #    0.311 K/sec                    ( +-  1.17% )
                 0      cpu-migrations            #    0.000 K/sec                  
            11,574      page-faults               #    0.007 M/sec                    ( +-  0.00% )
     6,202,481,014      cycles                    #    3.569 GHz                      ( +-  3.30% )
     3,130,334,695      stalled-cycles-frontend   #   50.47% frontend cycles idle     ( +-  6.71% )
     7,218,133,387      instructions              #    1.16  insn per cycle         
                                                  #    0.43  stalled cycles per insn  ( +-  0.01% )
     1,409,663,201      branches                  #  811.110 M/sec                    ( +-  0.01% )
        22,536,318      branch-misses             #    1.60% of all branches          ( +-  0.39% )

       1.745584013 seconds time elapsed                                          ( +-  2.81% )