var cluster = require('cluster'); var http = require('http'); var numCPUs = require('os').cpus().length; if (cluster.isMaster) { // 創建工作進程 for (var i = 0; i < numCPUs; i++) { cluster.fork(); } cluster.on('death', function(worker) { console.log('worker ' + worker.pid + ' died'); cluster.fork();//重啟子進程 }); } else { // 工作進程創建http 服務器 http.Server(function(req, res) { res.writeHead(200); res.end("hello world/n"); }).listen(8000); } 

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 { // 服務器   http.createServer(function(req,res) {     res.writeHead(200);     res.end('hello world/n')   }).listen(8000) // 每秒報告一次狀態   setInterval(function report(){     process.send({memory: process.memoryUsage(), process: process.pid});   }, 1000) } 

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 { // 服務器   http.Server(function(req,res) { // 打亂200 個請求中的1 個     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) // 每秒鐘報告一次狀態   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) // 允許開機時間   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.')       }     }   }) }