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

以上就是这篇文章的全部内容了，希望本文的内容对大家的学习或者工作能带来一定的帮助，如果有疑问大家可以留言交流，谢谢大家对的支持。