Iperf3-cygwin-gui

Abstract —Network performance testing is critical for infrastructure validation. Iperf3 is the industry standard for measuring maximum TCP/UDP throughput, but it lacks a native, modern graphical user interface (GUI) on Windows platforms. This paper presents Iperf3-Cygwin-GUI , a wrapper application that leverages the Cygwin POSIX emulation layer to execute Iperf3 on Windows while providing a real-time, interactive dashboard. We discuss the architectural challenges of bridging a Windows GUI (C#/WPF) with a Cygwin-based process, the implementation of real-time stream parsing, and performance benchmarks comparing the GUI overhead against native CLI execution. Results show that the GUI introduces less than 2% CPU overhead and no measurable impact on throughput accuracy.

4. Implementation Details 4.1 Real-time JSON Parsing Iperf3 outputs JSON incrementally only at the end of a test when using the default interval. To achieve real-time updates, we use the -i 1 flag (interval 1 second) and parse the "intervals" array from the stream:

{"start":{},"intervals":["sum":"bits_per_second":104857600]} A state machine parses line fragments because Cygwin can split JSON across multiple reads. Iperf3-Cygwin-GUI

[3] J. Postel, “Transmission Control Protocol,” RFC 793, 1981.

—Iperf3, Cygwin, Network Benchmarking, GUI, Windows, Real-time Visualization 1. Introduction Iperf3 [1] is the de facto tool for active network throughput measurement. However, its native command-line interface (CLI) presents usability barriers for network technicians, system administrators, and educators who require rapid, repeatable tests without memorizing flags (e.g., -P , -w , -O ). While Linux benefits from GUI wrappers like iptraf-ng or bmon , Windows users face a gap: native Windows ports of Iperf3 exist (e.g., iperf3-win ), but they lack integrated visualization and session management. We discuss the architectural challenges of bridging a

if (data.Contains("\"bits_per_second\"")) var match = Regex.Match(data, @"""bits_per_second"":\s*([0-9.]+)"); if (match.Success) double throughput = double.Parse(match.Groups[1].Value) / 1e6; Dispatcher.Invoke(() => UpdateChart(throughput));

private void OnDataReceived(string data) Implementation Details 4

[2] Cygwin Project. “Cygwin: Get that Linux feeling on Windows.” [Online]. Available: https://cygwin.com

Cygwin [2] provides a Unix-like environment on Windows, allowing Iperf3 to run with full POSIX socket compliance. However, interacting with a Cygwin process from a native Windows GUI introduces challenges in process lifecycle management, output redirection, and signal handling.