Cluster
cluster.fork() --> child_process.for()var cluster = require('cluster');
var cpuNums = require('os').cpus().length;
var http = require('http');
if(cluster.isMaster){
for(var i = 0; i < cpuNums; i++){
cluster.fork();
}
}else{
http.createServer(function(req, res){
res.end('ok');
}).listen(3000);
}worker对象
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