叢集示例
Node.js
的單個例項在單個執行緒中執行。為了利用多核系統,可以在 Node.js 程序叢集中啟動應用程式來處理負載。
cluster
模組允許你輕鬆建立所有共享伺服器埠的子程序。
下面的示例在主程序中建立 worker 子程序,以處理跨多個核的負載。
例
const cluster = require('cluster');
const http = require('http');
const numCPUs = require('os').cpus().length; //number of CPUS
if (cluster.isMaster) {
// Fork workers.
for (var i = 0; i < numCPUs; i++) {
cluster.fork(); //creating child process
}
//on exit of cluster
cluster.on('exit', (worker, code, signal) => {
if (signal) {
console.log(`worker was killed by signal: ${signal}`);
} else if (code !== 0) {
console.log(`worker exited with error code: ${code}`);
} else {
console.log('worker success!');
}
});
} else {
// Workers can share any TCP connection
// In this case it is an HTTP server
http.createServer((req, res) => {
res.writeHead(200);
res.end('hello world\n');
}).listen(3000);
}