code: function updateCpu (cpu, next) {
    if (cpu !== null) {
      getRealUptime(function (err, uptime) {
        if (err) return next(err)
        cpu.uptime = uptime
        next(null, cpu)
      })
      return
    }
  
    parallel([
      getClockAndPageSize,
      getRealUptime
    ], function (err, data) {
      if (err) return next(err)
  
      cpu = {
        clockTick: data[0].clockTick,
        pageSize: data[0].pageSize,
        uptime: data[1]
      }
  
      next(null, cpu)
    })
  }
docs: Gathers Clock, PageSize and system uptime through /proc/uptime
  This method is mocked in procfile tests