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Stop guessing why your AI jobs stall or OOM: this bash-first Linux guide shows how to install and use vendor GPU CLIs (nvidia-smi, rocm-smi, intel_gpu_top), get live snapshots and friendly TUI dashboards (gpustat, nvitop), log time-series for postmortems, and export Prometheus metrics via Node Exporter or DCGM. Includes copy/paste commands, troubleshooting cues, and tips to boost utilization, avoid throttling, and cut costs.