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ci: add benchmark workflow
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@@ -0,0 +1,278 @@
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#!/usr/bin/env python3
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"""Compare benchmark JSON files and write a GitHub Actions summary."""
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from __future__ import annotations
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import argparse
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import json
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import math
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from dataclasses import dataclass
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from pathlib import Path
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from typing import Any
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@dataclass(frozen=True)
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class Benchmark:
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name: str
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value: float
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unit: str
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metric: str = "value"
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@dataclass(frozen=True)
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class Comparison:
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name: str
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baseline: float
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current: float
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delta_percent: float
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unit: str
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metric: str
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regressed: bool
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def _read_json(path: Path) -> Any:
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with path.open("r", encoding="utf-8") as stream:
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return json.load(stream)
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def _as_float(value: Any) -> float | None:
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try:
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result = float(value)
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except (TypeError, ValueError):
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return None
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if math.isfinite(result):
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return result
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return None
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def _extract_hyperfine(data: dict[str, Any]) -> dict[str, Benchmark]:
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benchmarks: dict[str, Benchmark] = {}
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for result in data.get("results", []):
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if not isinstance(result, dict):
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continue
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name = str(result.get("command") or result.get("name") or "").strip()
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metric = "median"
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value = _as_float(result.get(metric))
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if value is None:
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metric = "mean"
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value = _as_float(result.get(metric))
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if name and value is not None:
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benchmarks[name] = Benchmark(name=name, value=value, unit="s", metric=metric)
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return benchmarks
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def _extract_pytest_benchmark(data: dict[str, Any]) -> dict[str, Benchmark]:
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benchmarks: dict[str, Benchmark] = {}
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for benchmark in data.get("benchmarks", []):
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if not isinstance(benchmark, dict):
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continue
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name = str(benchmark.get("fullname") or benchmark.get("name") or "").strip()
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stats = benchmark.get("stats", {})
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value = None
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metric = "median"
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if isinstance(stats, dict):
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value = _as_float(stats.get(metric))
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if value is None:
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metric = "mean"
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value = _as_float(stats.get(metric))
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if name and value is not None:
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benchmarks[name] = Benchmark(name=name, value=value, unit="s", metric=metric)
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return benchmarks
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def _extract_simple_mapping(data: dict[str, Any]) -> dict[str, Benchmark]:
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benchmarks: dict[str, Benchmark] = {}
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for name, raw_value in data.items():
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if name in {"version", "context", "commit", "timestamp"}:
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continue
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value = _as_float(raw_value)
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unit = ""
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metric = "value"
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if value is None and isinstance(raw_value, dict):
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value = _as_float(raw_value.get("value"))
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unit = str(raw_value.get("unit") or "")
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metric = str(raw_value.get("metric") or "value")
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if value is not None:
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benchmarks[str(name)] = Benchmark(name=str(name), value=value, unit=unit, metric=metric)
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return benchmarks
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def extract_benchmarks(path: Path) -> dict[str, Benchmark]:
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data = _read_json(path)
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if not isinstance(data, dict):
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raise ValueError(f"{path} must contain a JSON object")
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extractors = (_extract_hyperfine, _extract_pytest_benchmark, _extract_simple_mapping)
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for extractor in extractors:
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benchmarks = extractor(data)
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if benchmarks:
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return benchmarks
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raise ValueError(f"No supported benchmark entries found in {path}")
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def compare_benchmarks(
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baseline: dict[str, Benchmark],
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current: dict[str, Benchmark],
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threshold_percent: float,
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higher_is_better: bool,
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) -> tuple[list[Comparison], list[str], list[str]]:
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comparisons: list[Comparison] = []
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missing_in_current: list[str] = []
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new_in_current: list[str] = []
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for name, baseline_benchmark in sorted(baseline.items()):
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current_benchmark = current.get(name)
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if current_benchmark is None:
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missing_in_current.append(name)
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continue
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if baseline_benchmark.value == 0:
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delta_percent = 0.0
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else:
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delta_percent = (
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(current_benchmark.value - baseline_benchmark.value)
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/ abs(baseline_benchmark.value)
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* 100
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)
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if higher_is_better:
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regressed = delta_percent <= -threshold_percent
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else:
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regressed = delta_percent >= threshold_percent
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comparisons.append(
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Comparison(
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name=name,
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baseline=baseline_benchmark.value,
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current=current_benchmark.value,
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delta_percent=delta_percent,
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unit=current_benchmark.unit or baseline_benchmark.unit,
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metric=current_benchmark.metric,
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regressed=regressed,
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)
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)
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for name in sorted(set(current) - set(baseline)):
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new_in_current.append(name)
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return comparisons, missing_in_current, new_in_current
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def _format_value(value: float, unit: str) -> str:
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suffix = f" {unit}" if unit else ""
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return f"{value:.6g}{suffix}"
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def write_summary(
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path: Path,
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comparisons: list[Comparison],
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missing_in_current: list[str],
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new_in_current: list[str],
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threshold_percent: float,
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higher_is_better: bool,
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) -> None:
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regressions = [comparison for comparison in comparisons if comparison.regressed]
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direction = "higher is better" if higher_is_better else "lower is better"
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sorted_comparisons = sorted(comparisons, key=lambda comparison: comparison.name)
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lines = [
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"<!-- bw-benchmark-comment -->",
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"## Benchmark comparison",
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"",
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f"Threshold: {threshold_percent:g}% ({direction}).",
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]
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lines.append("")
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if regressions:
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lines.extend(
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[
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f"{len(regressions)} benchmark(s) regressed beyond the configured threshold.",
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"",
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"| Benchmark | Baseline | Current | Change |",
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"| --- | ---: | ---: | ---: |",
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]
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)
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for comparison in regressions:
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lines.append(
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"| "
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f"{comparison.name} | "
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f"{_format_value(comparison.baseline, comparison.unit)} | "
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f"{_format_value(comparison.current, comparison.unit)} | "
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f"{comparison.delta_percent:+.2f}% |"
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)
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else:
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lines.append("No benchmark regression exceeded the configured threshold.")
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if sorted_comparisons:
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lines.extend(
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[
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"",
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"<details>",
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"<summary>All benchmark results</summary>",
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"",
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"| Benchmark | Baseline | Current | Change | Status |",
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"| --- | ---: | ---: | ---: | --- |",
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]
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)
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for comparison in sorted_comparisons:
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status = "regressed" if comparison.regressed else "ok"
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lines.append(
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"| "
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f"{comparison.name} | "
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f"{_format_value(comparison.baseline, comparison.unit)} | "
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f"{_format_value(comparison.current, comparison.unit)} | "
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f"{comparison.delta_percent:+.2f}% | "
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f"{status} |"
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)
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lines.extend(["", "</details>"])
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if missing_in_current:
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lines.extend(["", "Missing benchmarks in the current run:"])
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lines.extend(f"- `{name}`" for name in missing_in_current)
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if new_in_current:
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lines.extend(["", "New benchmarks in the current run:"])
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lines.extend(f"- `{name}`" for name in new_in_current)
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path.parent.mkdir(parents=True, exist_ok=True)
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path.write_text("\n".join(lines) + "\n", encoding="utf-8")
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def main() -> int:
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parser = argparse.ArgumentParser()
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parser.add_argument("--baseline", required=True, type=Path)
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parser.add_argument("--current", required=True, type=Path)
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parser.add_argument("--summary", required=True, type=Path)
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parser.add_argument("--threshold-percent", required=True, type=float)
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parser.add_argument("--higher-is-better", action="store_true")
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args = parser.parse_args()
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baseline = extract_benchmarks(args.baseline)
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current = extract_benchmarks(args.current)
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comparisons, missing_in_current, new_in_current = compare_benchmarks(
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baseline=baseline,
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current=current,
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threshold_percent=args.threshold_percent,
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higher_is_better=args.higher_is_better,
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)
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write_summary(
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path=args.summary,
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comparisons=comparisons,
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missing_in_current=missing_in_current,
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new_in_current=new_in_current,
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threshold_percent=args.threshold_percent,
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higher_is_better=args.higher_is_better,
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)
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return 1 if any(comparison.regressed for comparison in comparisons) else 0
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if __name__ == "__main__":
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raise SystemExit(main())
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