vb 0.2.7

The fastest VByte/Varint encoding library in Rust / Rust 生态最快的变长字节编码库
Documentation 
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#!/usr/bin/env bun

import { readFileSync, writeFileSync, existsSync } from "fs";
import { join } from "path";
import { execSync } from "child_process";

const ROOT = import.meta.dirname;
const REGRESS_JSON = join(ROOT, "benches/regress.json");
const REGRESS_HTML = join(ROOT, "benches/regress.html");

// All benchmark targets to test
const BENCHMARKS = [
  { name: "e_li", key: "fn_e_li/10k_mixed", label: "e_li()" },
  { name: "d_li", key: "fn_d_li/10k_mixed", label: "d_li()" },
];

const DIFF_BENCHMARKS = [
  { name: "e_diff", key: "fn_e_diff/10k_increasing", label: "e_diff()" },
  { name: "d_diff", key: "fn_d_diff/10k_increasing", label: "d_diff()" },
];

function parseAllBenchmarks(output) {
  const results = {};
  // Normalize output - join lines that are split
  const normalized = output.replace(/\r?\n\s*/g, " ");
  // Match: fn_e/small time: [22.507 ns 22.582 ns 22.679 ns]
  // Note: µ is a special unicode character, use . to match any char for unit
  const regex = /([a-z_]+\/[a-z0-9_]+)\s+time:\s+\[([\d.]+)\s+([^\s\]]+)\s+([\d.]+)\s+([^\s\]]+)\s+([\d.]+)\s+([^\s\]]+)\s*\]/gi;
  let match;
  while ((match = regex.exec(normalized)) !== null) {
    const benchKey = match[1];
    let time = parseFloat(match[4]); // middle value (mean)
    const unit = match[5];

    // Convert to nanoseconds
    if (unit === "ps") time /= 1000;  // picoseconds to ns
    else if (unit.includes("µ") || unit.includes("us") || unit === "µs") time *= 1000;
    else if (unit.includes("ms")) time *= 1000000;
    else if (unit === "s") time *= 1000000000;
    // ns stays as is

    results[benchKey] = time;
  }
  return results;
}

function formatTime(ns) {
  if (!ns) return "N/A";
  if (ns < 1000) return `${ns.toFixed(2)} ns`;
  if (ns < 1000000) return `${(ns / 1000).toFixed(2)} µs`;
  if (ns < 1000000000) return `${(ns / 1000000).toFixed(2)} ms`;
  return `${(ns / 1000000000).toFixed(2)} s`;
}

function formatDiff(curr, prev) {
  if (!prev || prev === 0 || !curr) return "";
  const diff = ((curr - prev) / prev) * 100;
  const sign = diff >= 0 ? "+" : "";
  const color = diff <= -1 ? "32" : diff >= 1 ? "31" : "33";
  return `\x1b[${color}m${sign}${diff.toFixed(1)}%\x1b[0m`;
}

function formatTimeHtml(ns) {
  if (!ns) return "N/A";
  if (ns < 1000) return `${ns.toFixed(2)} ns`;
  if (ns < 1000000) return `${(ns / 1000).toFixed(2)} µs`;
  if (ns < 1000000000) return `${(ns / 1000000).toFixed(2)} ms`;
  return `${(ns / 1000000000).toFixed(2)} s`;
}

function genHtml(entry, history, allBenchmarks) {
  const colors = [
    "#00d4ff", "#0f0", "#ff6b6b", "#ffa500", "#9370db", "#20b2aa",
    "#ff69b4", "#7fff00", "#dda0dd", "#87ceeb", "#f0e68c", "#cd5c5c"
  ];

  const latestMetrics = allBenchmarks.map((b, i) => {
    const val = entry[b.name];
    const prev = history.length >= 2 ? history[history.length - 2][b.name] : null;
    const diff = prev && val ? (((val - prev) / prev) * 100).toFixed(1) : null;
    const diffClass = diff ? (parseFloat(diff) <= -1 ? "improved" : parseFloat(diff) >= 1 ? "regressed" : "neutral") : "";
    return `
      <div class="metric">
        <div class="label">${b.label}</div>
        <div class="value">${formatTimeHtml(val)}</div>
        ${diff !== null ? `<div class="diff ${diffClass}">${parseFloat(diff) >= 0 ? "+" : ""}${diff}%</div>` : ""}
      </div>`;
  }).join("");

  const datasets = allBenchmarks.map((b, i) => `{
    label: "${b.label}",
    data: data.map(d => d.${b.name}),
    borderColor: "${colors[i % colors.length]}",
    backgroundColor: "${colors[i % colors.length]}22",
    fill: false,
    tension: 0.3,
    hidden: ${i >= 6}
  }`).join(",\n        ");

  return `<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>VByte Performance Regression</title>
  <script src="https://cdn.jsdelivr.net/npm/chart.js"></script>
  <style>
    body { font-family: -apple-system, sans-serif; margin: 20px; background: #1a1a2e; color: #eee; }
    h1 { color: #00d4ff; margin-bottom: 5px; }
    .subtitle { color: #888; margin-bottom: 20px; }
    .latest { background: #16213e; padding: 15px; border-radius: 8px; margin: 20px 0; }
    .latest h3 { margin-top: 0; color: #00d4ff; }
    .metrics { display: flex; flex-wrap: wrap; gap: 15px; }
    .metric { background: #0f3460; padding: 12px 16px; border-radius: 6px; min-width: 140px; }
    .metric .label { font-size: 11px; color: #888; margin-bottom: 4px; }
    .metric .value { font-size: 18px; font-weight: bold; color: #fff; }
    .metric .diff { font-size: 12px; margin-top: 4px; }
    .metric .diff.improved { color: #0f0; }
    .metric .diff.regressed { color: #f66; }
    .metric .diff.neutral { color: #ff0; }
    .chart-container { width: 100%; max-width: 1200px; margin: 30px 0; }
    .note { color: #666; font-size: 12px; margin-top: 10px; }
  </style>
</head>
<body>
  <h1>VByte Performance Regression</h1>
  <div class="subtitle">Commit: ${entry.commit} (${entry.branch}) | ${entry.date}</div>

  <div class="latest">
    <h3>Latest Results</h3>
    <div class="metrics">${latestMetrics}</div>
    <div class="note">Lower is better. Green = improved, Red = regressed vs previous.</div>
  </div>

  <div class="chart-container"><canvas id="chart"></canvas></div>

  <script>
    const data = ${JSON.stringify(history)};
    const labels = data.map(d => d.commit);

    new Chart(document.getElementById("chart"), {
      type: "line",
      data: {
        labels,
        datasets: [
        ${datasets}
        ]
      },
      options: {
        responsive: true,
        interaction: { mode: "index", intersect: false },
        plugins: {
          legend: { labels: { color: "#eee" }, position: "bottom" },
          title: { display: true, text: "Execution Time (ns) - Lower is Better", color: "#eee" }
        },
        scales: {
          x: { ticks: { color: "#888" }, grid: { color: "#333" } },
          y: { ticks: { color: "#888" }, grid: { color: "#333" }, type: "logarithmic" }
        }
      }
    });
  </script>
</body>
</html>`;
}

// ============ Main ============
console.log("🚀 Running VByte benchmarks...\n");

const commit = execSync("git rev-parse --short HEAD 2>/dev/null || echo unknown", { encoding: "utf8" }).trim();
const branch = execSync("git branch --show-current 2>/dev/null || echo unknown", { encoding: "utf8" }).trim();
const date = new Date().toISOString().replace("T", " ").slice(0, 19);

const entry = { date, commit, branch };

// Run core benchmarks
console.log("  Running core benchmarks...");
try {
  const output = execSync("cargo bench --bench comparison_benchmarks 2>&1", { 
    cwd: ROOT, encoding: "utf8", timeout: 300000 
  });
  const results = parseAllBenchmarks(output);
  for (const b of BENCHMARKS) {
    entry[b.name] = results[b.key] || null;
  }
} catch (e) {
  console.error("  ⚠ Core benchmarks failed");
}

// Run diff benchmarks
console.log("  Running diff benchmarks...");
try {
  const output = execSync("cargo bench --features diff --bench comparison_benchmarks 2>&1", { 
    cwd: ROOT, encoding: "utf8", timeout: 300000 
  });
  const results = parseAllBenchmarks(output);
  for (const b of DIFF_BENCHMARKS) {
    entry[b.name] = results[b.key] || null;
  }
} catch (e) {
  console.error("  ⚠ Diff benchmarks failed");
}

const allBenchmarks = [...BENCHMARKS, ...DIFF_BENCHMARKS];

// Load history
let history = existsSync(REGRESS_JSON) ? JSON.parse(readFileSync(REGRESS_JSON, "utf8")) : [];
const prev = history.length > 0 ? history[history.length - 1] : null;

// Save
history.push(entry);
if (history.length > 128) history = history.slice(-128);
writeFileSync(REGRESS_JSON, JSON.stringify(history, null, 2));
writeFileSync(REGRESS_HTML, genHtml(entry, history, allBenchmarks));

// Print summary
console.log("\n" + "=".repeat(60));
console.log("📊 VByte Performance Report");
console.log(`   Commit: ${commit} (${branch})`);
console.log(`   Date:   ${date}`);
console.log("=".repeat(60));

console.log("\n📈 Results (vs previous):\n");
const colW = 16;
console.log(`${"Function".padEnd(colW)} ${"Time".padStart(12)} ${"Change".padStart(12)}`);
console.log("-".repeat(colW + 26));

for (const b of allBenchmarks) {
  const curr = entry[b.name];
  const prevVal = prev ? prev[b.name] : null;
  const timeStr = formatTime(curr).padStart(12);
  const diffStr = formatDiff(curr, prevVal);
  console.log(`${b.label.padEnd(colW)} ${timeStr} ${diffStr}`);
}

console.log("\n📄 HTML Report: " + REGRESS_HTML);
console.log("✅ Done.\n");