Cluster
cluster 模块允许轻松创建所有共享服务器端口的子进程。
js
const cluster = require('cluster')
const numCPUs = require('os').availableParallelism()
const http = require('http');
// windows 系统下，调度策略默认值为SCHED_NONE，即不调度
cluster.schedulingPolicy = cluster.SCHED_RR
if(cluster.isMaster){
for(let i = 0; i < numCPUs ; i++){
cluster.fork();
}
console.log(`Master ${process.pid} started`);
}else{
http.createServer(function(req, res){
res.end(`response from worker ${process.pid}`);
}).listen(3000);
console.log(`Worker ${process.pid} started`);
}创建一个shell脚本测试负载均衡效果
sh
#!/bin/bash
# req.sh
for((i=1;i<=4;i++)); do
curl http://127.0.0.1:3000
echo ""
done