Easily run benchmarks on Nix/NixOS in a quick and reproducible way (CPU, memory, IO, GPU, network, etc.).

# list presets / benchmarks directly from the flake
nix run github:dbeley/nixos-benchmark -- --list-presets
nix run github:dbeley/nixos-benchmark -- --list-benchmarks

# run the default preset
nix run github:dbeley/nixos-benchmark --

# target presets or specific benches
# comma-separated syntax or repeated arguments work for both presets and benchmarks options
nix run github:dbeley/nixos-benchmark -- --presets cpu --presets io
nix run github:dbeley/nixos-benchmark -- --benchmarks openssl-speed,fio-seq

• Nix with flakes enabled
• Optional: direnv for automatic shell loading
• Unfree GPU tools: set NIXPKGS_ALLOW_UNFREE=1 when running (needed for FurMark)

Available presets: balanced (default), cpu, io, memory, compression, crypto, database, gpu-light, gpu, network, all. Use --presets all if you want every benchmark.

• CPU: openssl speed, 7-Zip, John, Stockfish, stress-ng, sysbench cpu, geekbench
• Memory: sysbench memory, stressapptest, tinymembench
• IO / storage: fio seq, ioping, iozone, bonnie++, sqlite mixed, sqlite speedtest, cryptsetup
• Compression: zstd, pigz, lz4, x264, x265, ffmpeg transcode
• GPU: glmark2, furmark-gl, furmark-vk, furmark-knot-gl, furmark-knot-vk, clpeak, hashcat, geekbench gpu (default + vulkan)
• Network: netperf, wrk (local HTTP)

Use --list-benchmarks to see the exact preset coverage for each entry.

• JSON per run in results/ (git-ignored): system info (CPU, GPU, RAM, OS/kernel), requested presets/benchmarks, per-benchmark metrics, command, duration, tool version, and raw output.
• HTML dashboard (--html-summary path to override the output filename) reads all JSON files in results/ and shows run summaries. Each row carries its own system details and benchmark versions; hover a system name for a tooltip if you need the full breakdown.
• Refresh the HTML dashboard without running benchmarks: python -m nixos_benchmark --html-only (or nix run . -- --html-only) reads existing JSON results and writes to the --html-summary path.

• glmark2 defaults to offscreen; pass --glmark2-mode onscreen if you want visible rendering.
• Geekbench requires internet access to publish results; follow the printed link if scores are missing from stdout.