Raspberry Pi wiringPi speed test program
Native wiringPi method: (10000000 iterations)
  Pass: 0:       701mS
  Pass: 1:       702mS
  Pass: 2:       701mS
   Average:      701mS: 14258555/sec
Native GPIO method: (10000000 iterations)
  Pass: 0:       597mS
  Pass: 1:       597mS
  Pass: 2:       599mS
   Average:      597mS: 16731734/sec
/sys/class/gpio method: ( 1000000 iterations)
  Pass: 0:      4156mS
  Pass: 1:      4163mS
  Pass: 2:      4129mS
   Average:     4149mS: 241002/sec