Java Hardware Performance Monitor

A lightweight, multi-threaded Java system utility designed to track and display real-time hardware performance metrics via a borderless, semi-transparent gaming overlay.

Features

• Real-Time Overlay: Borderless, semi-transparent GUI that always stays on top (ideal for gaming).
• Native OS Hooks: Utilizes the OSHI library to interface directly with Windows Native APIs.
• Zero-Overhead Daemon: Implements Java Concurrency ScheduledExecutorService for a near-zero resource footprint background polling loop.
• Dynamic GPU Tracking: Bypasses traditional single-shot WMI constraints by running persistent background daemon threads that parse typeperf (Windows Performance Counters) and nvidia-smi kernel streams to calculate live GPU Utilization and VRAM usage.
• Hardware Bug Bypasses: Implements custom heuristic string parsing to overcome Windows WMI 32-bit integer overflow limits on GPUs with > 4GB of VRAM.

How to Build

This project uses Maven. To compile the code into a native Windows executable (.exe):

mvn clean package

The resulting executable will be located at target/HardwareMonitor.exe.

Note on Security: Due to strict Microsoft Kernel security limits preventing user-mode applications from reading hardware thermal zones, the embedded Windows Manifest explicitly requests requireAdministrator execution level. Running the .exe will prompt for UAC permission.

Tech Stack

• Language: Java 11
• Build Tool: Maven (Maven Shade Plugin, Launch4j)
• Libraries: OSHI Core, SLF4J, JNA
• OS APIs: WMI, PDH (typeperf), NVAPI (nvidia-smi)