Async / Await会降低服务器性能 [英] Async/Await degrades server performance

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: http://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);

};

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