指定 dns 服务器，测试该 dns 服务器的 A 记录每秒解析速率

node-dns-benchmark.js

const { Resolver } = require('node:dns').promises;
const { performance } = require('perf_hooks');

const domain = 'giao.com';

const resolver = new Resolver();
resolver.setServers(['192.168.31.117']);

async function main() {
  const numIterations = 1;
  const taskOfInteration = 2000;
  let totalTime = 0;

  // for (let index = 0; index < numIterations; index++) {
  const tasks = [];
  Array(taskOfInteration)
    .fill(undefined)
    .forEach((x) => tasks.push(resolveDnsARecord(domain)));

  const t0 = performance.now();
  await Promise.all(tasks);
  const t1 = performance.now();
  totalTime += t1 - t0;
  // }

  const averageTime = totalTime / (numIterations * taskOfInteration);
  const executionsPerSecond = 1000 / averageTime;
  console.log('executionsPerSecond = ', executionsPerSecond);
}

function resolveDnsARecord(domain) {
  return resolver.resolve4(domain, { ttl: 0 });
}

main()
//setInterval(main, 3000);