bencher noise CLI Subcommand

bencher noise

The bencher noise CLI subcommand measures environment noise to help you understand how reliable your benchmark results will be. It runs a series of micro-benchmarks and collects platform metrics to produce a composite noise score.

The following measurements are performed:

• Compute Jitter: Measures CPU computation consistency by running tight arithmetic loops and tracking the coefficient of variation (CoV) across iterations.
• Cache Jitter: Measures memory cache access consistency by performing sequential reads across a buffer sized to the L3 cache.
• I/O Jitter: Measures filesystem I/O consistency by writing and reading temporary files and tracking timing variation.
• CPU Steal: On virtualized platforms, detects how much CPU time is being taken by the hypervisor.
• Noise Score: A composite score (0–100 dB) combining all measurements into a single indicator of environment noise level.

bencher noise Usage

bencher noise [OPTIONS]

Options

--duration <SECONDS>

Total measurement duration in seconds.

Default: 60

--format <FORMAT>

Output format for the noise report.

• human: Human-readable terminal output with visual noise bars and advice.
• json: BMF (Bencher Metric Format) JSON output, suitable for piping to bencher run.

Default: human

--quiet

Suppress progress output and only print the final result. Useful for scripting and CI environments.

--help

Print help.