node.js中cluster的使用教程

本文主要给大家介绍了关于node.js中cluster使用的相关教程，分享出来供大家参考学习，下面来看看详细的介绍：

一、使用NODE中cluster利用多核CPU

var cluster = require('cluster');
var http = require('http');
var numCPUs = require('os').cpus().length;
if (cluster.isMaster) {
// 创建工作进程
for (var i = 0; i < numCPUs; i++) {
cluster.fork();
}
cluster.on('death', function(worker) {
console.log('worker ' + worker.pid + ' died');
cluster.fork();//重启子进程
});
} else {
// 工作进程创建http 服务器
http.Server(function(req, res) {
res.writeHead(200);
res.end("hello world\n");
}).listen(8000);
} 

二、通过消息传递来监控工作进程状态

var cluster = require('cluster');
var http = require('http');
var numCPUs = require('os').cpus().length;
var rssWarn = (12 * 1024 * 1024)
  , heapWarn = (10 * 1024 * 1024)
if(cluster.isMaster) {
  for(var i=0; i<numCPUs; i++) {
    var worker = cluster.fork();
    worker.on('message', function(m) {
      if (m.memory) {
        console.log(m.memory.rss,rssWarn)
        if(m.memory.rss > rssWarn) {
          console.log('Worker ' + m.process + ' using too much memory.')
        }
      } 

    })
  }
} else {
// 服务器
  http.createServer(function(req,res) {
    res.writeHead(200);
    res.end('hello world\n')
  }).listen(8000)
// 每秒报告一次状态
  setInterval(function report(){
    process.send({memory: process.memoryUsage(), process: process.pid});
  }, 1000)
} 

三、杀死僵尸进程

var cluster = require('cluster');
var http = require('http');
var numCPUs = require('os').cpus().length;
var rssWarn = (50 * 1024 * 1024)
  , heapWarn = (50 * 1024 * 1024)
var workers = {}
if(cluster.isMaster) {
  for(var i=0; i<numCPUs; i++) {
    createWorker()
  }
  setInterval(function() {
    var time = new Date().getTime()
    for(pid in workers) {
      if(workers.hasOwnProperty(pid) &&
        workers[pid].lastCb + 5000 < time) {
        console.log('Long running worker ' + pid + ' killed')
        workers[pid].worker.kill()
        delete workers[pid]
        createWorker()
      }
    }
  }, 1000)
} else {
// 服务器
  http.Server(function(req,res) {
// 打乱200 个请求中的1 个
    if (Math.floor(Math.random() * 200) === 4) {
      console.log('Stopped ' + process.pid + ' from ever finishing')
      while(true) { continue }
    }
    res.writeHead(200);
    res.end('hello world from ' + process.pid + '\n')
  }).listen(8000)
// 每秒钟报告一次状态
  setInterval(function report(){
    process.send({cmd: "reportMem", memory: process.memoryUsage(),
      process: process.pid})
  }, 1000)
}
function createWorker() {
  var worker = cluster.fork()
  console.log('Created worker: ' + worker.pid)
// 允许开机时间
  workers[worker.pid] = {worker:worker, lastCb: new Date().getTime()-1000}
  worker.on('message', function(m) {
    if(m.cmd === "reportMem") {
      workers[m.process].lastCb = new Date().getTime()
      if(m.memory.rss > rssWarn) {
        console.log('Worker ' + m.process + ' using too much memory.')
      }
    }
  })
} 

总结

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