nodejs中cluster使用

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摘自<node.js即学即用>第3章

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);}

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)}

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.')            }        }    })}

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