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

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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