bench.go
func (b *Bench) AddOutput(interval time.Duration, writer io.Writer, output output.OutputFunc) {

	o := outputContainer{
		interval: interval,
		writer:   writer,
		function: output,
	}

	b.outputs = append(b.outputs, o)
}
func (b *Bench) AddOutput(interval time.Duration, writer io.Writer, output output.OutputFunc) {

	o := outputContainer{
		interval: interval,
		writer:   writer,
		function: output,
	}

	b.outputs = append(b.outputs, o)
}
// AddOutput adds an output writer to Bench