Question

我正在试图确定这是否是一个公平的基准。目标是尝试查看各种大小的Node.JS可以处理多少并发连接与有效负载。代码如下。

var express = require('express');
var Sequelize = require('sequelize');
var fs = require('fs');
var app = express();


var data;

var filename = process.argv[2] || './start.json';
console.log("Using: " + filename);
data = fs.readFileSync(filename);

var blockSize = 250000;
app.get('/start', function (req, res) {
  // Break up data in blocks.  Works to super high concurrents.
  // for(var i = 0; i < data.length; i+=blockSize)
  //   res.write(data.slice(i, i+blockSize));  

   // Can only handle about 600 concurrent requests if datasize > 500KB
   res.send(data);
});



app.listen(3000, function () {
  console.log('Listing on 3000.');
});

如评论中所述，如果有效负载大小大于约500KB并且有500个并发，则它将在负载测试客户端获得“通过对等方重置连接”。如果您将数据切片并以块的形式写入，那么在开始之前它可以存活到更高的并发数。 stock node和express都表现出这种行为。

Answer 1

data = fs.readFileSync(filename);

同步方法是nodejs杀手。它实际上阻止了 ALL 请求的事件循环，使得表现非常糟糕。

试试这个：

var express = require('express');
var Sequelize = require('sequelize');
var fs = require('fs');
var app = express();
var filename = process.argv[2] || './start.json';

var blockSize = 250000;
app.get('/start', function (req, res) {
  // Break up data in blocks.  Works to super high concurrents.
  // for(var i = 0; i < data.length; i+=blockSize)
  //   res.write(data.slice(i, i+blockSize));  

   // Can only handle about 600 concurrent requests if datasize > 500KB
   console.log("Using: " + filename);

   fs.readFile(filename, function (err, data) {
      if (err) throw err;
      res.send(data);
   });

});



app.listen(3000, function () {
  console.log('Listing on 3000.');
});

Answer 2

作为替代方案，您可以创建一个读取流并管道它，这是基于您的代码的示例

var express = require('express');
var fs = require('fs');
var app = express();

var data;

var filename = process.argv[2] || './data.json';
console.log("Using: " + filename);
data = fs.readFileSync(filename);

var readStream = fs.createReadStream(filename);

app.get('/start', function (req, res) {
  // Can only handle about 600 concurrent requests if datasize > 500KB
  //res.send(data);
  readStream.pipe(res);
});

一个简单的Node.JS基准测试

2 个答案: