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   源码介绍

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

if (cluster.isMaster) {
  console.log('Master process started with PID:', process.pid);

  for (var i = 0; i < cpus; i  ) {
    cluster.fork();
  }

  // note core API change. the event is now exit.
  cluster.on('exit', function(worker) {
    // note core API change. the pid is now access through worker.process.pid
    console.log('worker '   worker.process.pid   ' died');
    cluster.fork();
  });

} else {
  console.log('Worker process started with PID:', process.pid);
  http.createServer(function (req, res) {
    res.writeHead(200, {'Content-Type': 'text/plain'});
    res.end('Hello World\n' process.pid);
  }).listen(3000);
}