Bun 性能优化 #

# 打包为可执行文件
bun build ./src/index.ts --compile --outfile app

# 分析依赖
bun pm ls

// 推荐：使用 Bun.file
const file = Bun.file("./data.txt");
const text = await file.text();

// 不推荐：使用 fs
import { readFile } from "fs/promises";
const text = await readFile("./data.txt", "utf-8");

import { Database } from "bun:sqlite";

// 比 npm sqlite3 快得多
const db = new Database(":memory:");

Bun.serve({
  port: 3000,
  async fetch(request) {
    const response = new Response(largeData);
    response.headers.set("Content-Encoding", "gzip");
    return response;
  },
});

const cache = new Map<string, Response>();

Bun.serve({
  port: 3000,
  fetch(request) {
    const cached = cache.get(request.url);
    if (cached) return cached;
    
    const response = generateResponse();
    cache.set(request.url, response);
    return response;
  },
});

// 大文件流式处理
const file = Bun.file("./large-file.txt");
const stream = file.stream();

for await (const chunk of stream) {
  processChunk(chunk);
}

// 关闭数据库连接
const db = new Database("./data.sqlite");
// 使用后关闭
db.close();

const used = process.memoryUsage();
console.log({
  rss: `${used.rss / 1024 / 1024} MB`,
  heapUsed: `${used.heapUsed / 1024 / 1024} MB`,
});

console.time("operation");
// 操作
console.timeEnd("operation");