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A practical Linux/Bash playbook for diagnosing and eliminating AI performance bottlenecks: measure first, then optimize data I/O and file formats, CPU/threading and NUMA placement, GPU utilization/precision, and network/NCCL. Includes distro-agnostic installs, actionable commands (sar/iostat, perf, nvidia-smi, fio, iperf3), a 15-minute baseline profile, and quick wins (packing, staging, mixed precision, pinning) to ship faster.