NodeJS-它如何处理请求

Question

Suppose you have the code below:

var http = require('http'); 
http.createServer(function (req, res) {
  res.writeHead(200, {'Content-Type': 'text/plain'});
  //Computations that takes one millisecond
  ............
  res.end('Hello World\n');
}).listen(8124, "127.0.0.1");

Questions:

1. Will Node handle that callbacks in parallel?
2. What would happen if we sent more that 1 request per millisecond (let's say 3 requests simultaneously)?
3. What would happen if we sent 150 000 requests per second?

Answer 1

Though I am new to nodejs, I will try to give some advices.

IMHO, Node doesn't handle any parallelism. It is single-thread, means only 1 process, 1 thread, 1 cpu. All his power resides in his non-blocking way of processing by using callback functions. This makes node stay rapid without the complexity of multithread.

If a single nodejs server is not enough for your huge incoming request, think of cluster to take advantage of multi-core system : http://nodejs.org/api/cluster.html

Just google. There are lots of articles on this topic.