node cluster模块的使用和测试

首先安装async包

用到的有http、cluster包

http和cluster都会node自带的包，无需安装

1：创建cluster.js，代码如下，更具cpu创建多个进程

var cluster = require("cluster");
var http = require("http");
var numCPUs = require('os').cpus().length;

if(cluster.isMaster){

console.log("[master] " + "start master......");

var data = 0;

for(var i=0; i<numCPUs; i++){

var work_process = cluster.fork();

}

cluster.on("listening", function(worker, address){

console.log("[master] " + "listening: worker "+worker.id + ", pid:"+worker.process.pid + ",Address:" + address.address + ":" + address.port);

});

cluster.on("exit", function(worker, code, signal){

console.log('worker ' + worker.process.pid + ' died');

});

}else{

http.createServer(function(req, res){

console.log("worker" + cluster.worker.id);

res.end("worker" + cluster.worker.id);

}).listen(30001);

}

执行该文件会看到有多个进程现在

2：创建httpClient.js用来请求刚才创建的30001端口的服务

var http = require("http");

var options = {

hostname: 'localhost',

port: 30001,

path: '/',

method: 'GET'

};

module.exports = function(callback){

var req = http.request(options, function(res) {

res.on('data', function (chunk) {

callback(chunk.toString());

});

});

req.on('error', function(e) {

console.log('problem with request: ' + e.message);

});

req.end();

};

3：创建test.js测试同步跑多个请求，最后统计出各个进程走的请求数量

var async = require("async");
var httpClient = require("./httpClient");

var sum = 10;
var t = {"1":0, "2":0,"3":0, "4":0};
var c=0;

for(var i=0; i<sum; i++){
    async.series([
        function(cb){
            httpClient(function(str){
                if(str === "worker1")
                    t["1"] = parseInt(t["1"] || 0) + 1;
                if(str === "worker2")
                    t["2"] = parseInt(t["2"] || 0) + 1;
                if(str === "worker3")
                    t["3"] = parseInt(t["3"] || 0) + 1;
                if(str === "worker4")
                    t["4"] = parseInt(t["4"] || 0) + 1;
                cb();
            });
        }
    ], function(err, result){
        if(err){
            console.log(err);
        }
        c++;
        if(c == sum){
            console.log(t);
        }
    });
}

其中Express和cluster结合使用

创建clusterMaster.js

var http = require("http");
var cluster = require("cluster");
var numCPUs = require("os").cpus().length;

var workerList = [];
function createWorker(){
　　var worker = cluster.fork();
　　worker.on("message", function(data){
　　　　console.log("the worker " + worker.id + "|" + worker.process.pid + " accept data: " + JSON.stringify(data));
　　　　if(data.type && data.type === "broadcast"){
　　　　　　workerList.forEach(function(wk){
　　　　　　　　wk.send(data.body);
　　　　　　});
　　　　}
　　});
　　return worker;
};

if(cluster.isMaster){
　　console.log("master process start...");
　　for (var i = 0; i < numCPUs; i++) {
　　　　    workerList.push(createWorker());

　　}
　　cluster.on('listening',function(worker, address){
　　　　　console.log("A worker with #" + worker.id + " pid " + worker.process.pid +
　　　　　　　　" is now connected to " + address.address + ":" + address.port);
　　});
　　cluster.on('exit', function(worker, code, signal) {
　　　　console.log('worker ' + worker.process.pid + ' died');
　　　　process.nextTick(function(){ cluster.fork(); });
　　});
}else{
　　require("./app.js");
}

以上cluster的功能就完成了，在app.js中添加监听message

process.on("message", function(data){
　　console.log("the process %s accept data: %s", process.pid, JSON.stringify(data));
});

在路由方法这种可以实现发送消息到master，master在.on("message")中收到消息后做操作

process.send({type: "broadcast", body:"ssssssss"});

以上就是node下cluster和express结合实现合理利用CPU