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loadbearer

A command-line tool that benchmarks a machine's CPU, memory and disk, scores each measurement against a reference baseline, and grades every component — and the machine as a whole — on an S-to-F scale. Its reason for existing is the two-machine question: run it on laptop A, run it on laptop B, and get a defensible answer to which is better, by how much, and why.

This wiki is the deep dive into how each part works. For install instructions, the full CLI options tables, and a quick cheat-sheet, see the README instead — the wiki links back to it rather than repeating it.

What do you want to do?

Goal	Command	Page
Grade this machine	loadbearer run	Benchmark Methodology, Scoring & Grades
Decide between two (or more) machines	loadbearer run --output a.json on each, then loadbearer compare a.json b.json	Comparing Machines
Score for a specific workload, not "general"	loadbearer run --profile dev-workstation	Scoring & Grades
Make results reproducible / scriptable	--seed, --config, --plain, --json	Configuration, Accuracy Notes
Trust the absolute scores, not just the deltas	build a baseline from your own hardware	The Baseline
Understand a number in the report	—	Scoring & Grades, Accuracy Notes

How a run flows

1. Measure. Each benchmark runs its subtests one at a time. A subtest runs for a fixed wall-clock budget and counts the work it got through; that happens several times and the median is taken, with the run-to-run spread becoming a confidence flag. See Benchmark Methodology.
2. Score. Every raw value is divided by the matching number in the baseline to get a ratio, which goes through a curve (score = 1000 · ratio^k). Component scores are the geometric mean of their subtests; the overall is a profile-weighted geometric mean of the components. See Scoring & Grades.
3. Report. The scored result is printed (a TUI in a terminal, plain text or JSON otherwise) and, with --output, written as a versioned JSON file that compare and baseline can read.

Pages

• Benchmark Methodology — exactly what the CPU, memory and disk kernels do, how they're timed, and why.
• Scoring & Grades — the ratio → curve → geometric-mean pipeline, the grade bands, confidence, and the four scoring profiles, all with worked numbers.
• Comparing Machines — how compare builds a verdict from raw metrics, what its warnings mean, and reading the table for two or more machines.
• The Baseline — what reference-v1 is, why it's provisional, the result-file schema, and rebuilding a baseline from your own result files.
• Configuration — the --config TOML file: every key, the precedence rules, and example configs.
• Accuracy Notes — what makes a result trustworthy or not: build flags, filesystem choice, thermals, queue depth, and what loadbearer deliberately does not measure.

Design notes

loadbearer never touches the network, needs no elevated privileges, and runs with no configuration. A run writes a few GiB to --target-dir for the disk benchmark and deletes it afterwards; --only cpu,memory skips that entirely.

The scoring is intentionally boring and transparent: a documented curve over a documented baseline, geometric means throughout, no hidden weighting. If you disagree with a grade band or a profile weight, they are a few constants in src/scoring and the result files keep the raw metrics so anything can be re-scored later.