Async / Await会降低服务器性能

本文介绍了Async / Await会降低服务器性能的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我正在使用以下代码编写HTTP服务器来检查使用 async / await 是否会影响性能

I'm using the following code to write a HTTP server to check if using async/await can impact the performance

const http = require('http') const server = http.createServer(reqResHandler); server.listen(3000, err => { if (err) throw err console.log('Server listening on: localost:3000') })

无承诺

const reqResHandler = (req, res) => { req.body = []; req.on('data', (chunk)=>req.body.push(chunk)); req.on('end', ()=>{ req.body = Buffer.concat(req.body); res.setHeader("content-length", req.body.length); res.end(req.body); }); };

承诺

async function getBody(req){ var end = new Promise(function(resolve, reject) { req.on('data', (chunk)=>req.body.push(chunk)); req.on('end', ()=>{req.body = Buffer.concat(req.body); resolve(req.body)}); req.on('error', reject); // or something like that }); await end; return req.body; } const reqResHandler = async (req, res) => { req.body = []; var data = await getBody(req); res.setHeader("content-length", data.length); res.end(data); };

当我使用没有承诺的代码时，它每秒产生的吞吐量高达30-31k。但是，如果我使用带有promise的代码，那么它的性能最高可达27-27.5k rps。

When I use the code without promise it gives throughput up to 30-31k requests per second. But if I use code with promise then it gives performance up to 27-27.5k rps max.

我是否正确使用异步等待？

Am I using the async await incorrectly?

推荐答案

你可以像这样执行异步：

You can do the async like this:

async function getBody(req){ return new Promise(function(resolve, reject) { req.on('data', (chunk)=>req.body.push(chunk)); req.on('end', ()=>{req.body = Buffer.concat(req.body); resolve(req.body)}); req.on('error', reject); // or something like that }); } const reqResHandler = async (req, res) => { req.body = []; let data = (await getBody(req)).body; res.setHeader("content-length", data.length); res.end(data);

};