GPU PCIe Link Diagnostic Tool Using NVML and CUDA Memcpy for Hardware Validation

Summary

This article describes a command-line diagnostic tool for validating GPU PCIe link health and bandwidth using observable hardware data (NVML + CUDA memcpy). The tool provides deterministic validation of GPU PCIe link behavior without requiring registry hacks, BIOS assumptions, or 'magic' optimizations. It focuses on measurable link state, copy throughput, and hardware counters to answer whether a GPU's PCIe link is functioning correctly. The project has been superseded by a newer repository but remains available for reference and diagnostic use cases.