def *(scalar)
      scalar = scalar.to_f
      self.class.new(*(
        [
          usage,
          processor_id,
        ] +
        values_at(2..-3).map { |x| x * scalar } +
        [
          start_at,
          stop_at,
        ])
      )
    end
def *(scalar)
      scalar = scalar.to_f
      self.class.new(*(
        [
          usage,
          processor_id,
        ] +
        values_at(2..-3).map { |x| x * scalar } +
        [
          start_at,
          stop_at,
        ])
      )
    end
Multiply the cpu times in this CPU::Usage instance with +scalar+.