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LagBox - Measuring the Latency of USB-Connected Input Devices

机译:Lagbox - 测量USB连接输入设备的延迟

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High latency in an interactive system limits its usability. In order to reduce end-to-end latency of such systems, it is necessary to analyze and optimize the latency of individual contributors, such as input devices, applications, or displays. We present a simple tool for measuring the latency of USB-connected input devices with sub-millisecond accuracy. The tool, based on a Raspberry Pi 2 microcomputer, repeatedly toggles a button of a game controller, mouse, or keyboard via an opto-coupler soldered to the button and measures the time until the input event arrives. This helps researchers, developers and users to identify and characterize sources of input lag. An initial comparison of multiple input devices shows differences not only in average latency but also in its variance.
机译:交互式系统中的高延迟限制了其可用性。 为了降低这种系统的端到端延迟,有必要分析和优化各个贡献者的延迟,例如输入设备,应用程序或显示。 我们提供了一种简单的工具,用于测量具有子毫秒精度的USB连接的输入设备的延迟。 该工具基于Raspberry PI 2微型计算机,通过焊接到按钮的光耦合器反复切换游戏控制器,鼠标或键盘的按钮,并测量输入事件到达直到输入事件的时间。 这有助于研究人员,开发人员和用户识别和表征输入滞后的来源。 多个输入设备的初始比较不仅显示平均延迟而且在其方差中显示差异。

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