dnsbench.js

const dns = require('dns');
const util = require('util');

const lookup = util.promisify(dns.lookup);
let timeStart = new Date().getTime();
let times = 0;
let minTime = Infinity;
let maxTime = 0;
let error = 0;

function bench(){
    let roundStart = new Date().getTime();
    lookup('www.wongnai.com').catch(() => {
        error++;
    }).then(() => {
        let duration = new Date().getTime() - roundStart;
        if(duration < minTime){
            minTime = duration;
        }
        if(duration > maxTime){
            maxTime = duration;
        }
        times++;
        return bench();
    });
}

function main(){
    bench();
    setInterval(() => {
        let runTime = Math.floor((new Date().getTime() - timeStart)/1000);
        console.log('Statistics:');
        console.log(`Running time: ${runTime}s`);
        console.log(`Qps: ${times/runTime}`);
        console.log(`Done: ${times}, Success: ${times-error} (${((times-error)/times)*100}%), Failed: ${error} (${(error/times)*100}%)`);
        console.log(`Max query time: ${maxTime}ms, min ${minTime}ms`);
        console.log('\n');
    }, 5000);
}

main();