Node.js--(2)

En utilisant le cluster, donc on va recuperer le nombre de CPU puis creer les fils.
Un truc magic, quand kill un fils , un autre fils va creer automatiquement grace a l'evenement on 'exit'.

const cluster = require('cluster');
const http = require('http');
const numCPUs = require('os').cpus().length;

if (cluster.isMaster) {
    console.log('main');
  // Fork workers.
  for (var i = 0; i < numCPUs; i++) {
    cluster.fork();
  }

  cluster.on('exit', (worker, code, signal) => {
    cluster.fork();
    console.log(`worker ${worker.process.pid} died `+signal);
  });
} else {
  // Workers can share any TCP connection
  // In this case it is an HTTP server
  http.createServer((req, res) => {
    res.writeHead(200);
    res.end('hello world\n');
  }).listen(8080,function(){
          console.log('[worker] : '+process.pid);
  });
}
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