nodejs线上如何使用多核cpu

const cluster = require('cluster');
const numCPUs = require('os').cpus().length;

if (cluster.isMaster) {
  console.log(`主进程 ${process.pid} 正在运行`);
  
  // Fork workers.
  for (let i = 0; i < numCPUs; i++) {
    cluster.fork();
  }
  
  cluster.on('exit', (worker, code, signal) => {
    console.log(`工作进程 ${worker.process.pid} 已经退出`);
  });
} else {
  console.log(`工作进程 ${process.pid} 已经启动`);
  
  // TODO: 实际的业务逻辑处理
}

const cluster = require('cluster');
const numCPUs = require('os').cpus().length;

function startWorker() {
  const worker = cluster.fork();
  console.log(`工作进程 ${worker.id} 已经启动`);
}

if (cluster.isMaster) {
  console.log(`主进程 ${process.pid} 正在运行`);
  
  // Fork workers.
  for (let i = 0; i < numCPUs; i++) {
    startWorker();
  }
  
  cluster.on('exit', (worker, code, signal) => {
    console.log(`工作进程 ${worker.process.pid} 已经退出，重启中...`);
    startWorker();
  });
  
  cluster.on('SIGUSR2', () => {
    console.log('收到信号，重启所有工作进程...');
    const workers = Object.values(cluster.workers);
    
    const restartWorker = (workerIndex) => {
      const worker = workers[workerIndex];
      if (!worker) return;
      
      worker.on('exit', () => {
        if (!worker.exitedAfterDisconnect) return;
        console.log(`工作进程 ${worker.process.pid} 重新启动`);
        startWorker();
        restartWorker(workerIndex + 1);
      });
      
      worker.disconnect();
    }
    
    restartWorker(0);
  });
  
} else {
  console.log(`工作进程 ${process.pid} 已经启动`);
  
  // TODO: 实际的业务逻辑处理
}

const cluster = require('cluster');
const Http = require('http');
const numCPUs = require('os').cpus().length;

if (cluster.isMaster) {
  console.log(`主进程 ${process.pid} 正在运行`);
  
  // Fork workers.
  for (let i = 0; i < numCPUs; i++) {
    cluster.fork();
  }
  
  cluster.on('exit', (worker, code, signal) => {
    console.log(`工作进程 ${worker.process.pid} 已经退出`);
  });
} else {
  console.log(`工作进程 ${process.pid} 已经启动`);
  
  const server = http.createServer((req, res) => {
    res.writeHead(200);
    res.end('你好世界
');
  });
  
  server.listen(3000, (err) => {
    if (err) throw err;
    console.log(`工作进程 ${process.pid} 正在监听3000端口`);
  });
}