Question

由于群集，在我的Node js应用程序中，该函数正在执行多次。我怎么能只运行一次功能？实际上，想要运行cron作业但是由于多次执行该函数，cron正在多次执行。

群集代码： `

var numCPUs = require('os').cpus().length;
if (cluster.isMaster) {
    // Fork workers.
    // console.log('numCPUs--------',numCPUs);
    for (var i = 0; i < numCPUs; i++) {
        cluster.fork();
        console.log(process.pid);
    }
    cluster.on('exit', function (worker, code, signal) {
        // handle server crashes
        console.log('worker ' + worker.process.pid + ' died');
    });
} else {
    console.log(cluster.worker.id);
    const port = process.env.PORT || 8000;
    app.listen(8000);
}
(function test() {
    console.log("THIS is test");
}());


OUTPUT: 4
THIS is test
1
3
THIS is test
THIS is test
2
THIS is test

`

Answer 1

将对测试的调用移至主块

var numCPUs = require('os').cpus().length;
if (cluster.isMaster) {
    test(); // calling test function moved to here
    // Fork workers.
    // console.log('numCPUs--------',numCPUs);
    for (var i = 0; i < numCPUs; i++) {
        cluster.fork();
        console.log(process.pid);
    }
    cluster.on('exit', function (worker, code, signal) {
        // handle server crashes
        console.log('worker ' + worker.process.pid + ' died');
    });
} else {
    console.log(cluster.worker.id);
    const port = process.env.PORT || 8000;
    app.listen(8000);
}

// implementing the function only
function test () {
    console.log("THIS is test");
}

功能按CPU核心运行多次（在我的情况下CPU核心= 4）。我怎么能只运行一次功能？

1 个答案: