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

       2218.155599      task-clock (msec)         #    0.997 CPUs utilized            ( +-  0.51% )
               350      context-switches          #    0.158 K/sec                    ( +-  1.52% )
                 0      cpu-migrations            #    0.000 K/sec                  
            11,575      page-faults               #    0.005 M/sec                    ( +-  0.00% )
     8,332,430,600      cycles                    #    3.756 GHz                      ( +-  0.18% )
     5,115,030,169      stalled-cycles-frontend   #   61.39% frontend cycles idle     ( +-  0.24% )
     7,270,682,113      instructions              #    0.87  insn per cycle         
                                                  #    0.70  stalled cycles per insn  ( +-  0.01% )
     1,414,816,326      branches                  #  637.835 M/sec                    ( +-  0.01% )
        23,789,235      branch-misses             #    1.68% of all branches          ( +-  1.60% )

       2.225367816 seconds time elapsed                                          ( +-  0.51% )