nodejs 多线程通信 线程计算测试

###main.js

let child = require('child_process');
let os = require('os');

let time = 1;

createChild();
function createChild() {
    let start = new Date().getTime();
    let cpus = os.cpus();
    for(let i=0;i<cpus.length;i++){
        let child_process = child.fork('./zhishu.js');
        child_process.on('message',function (m) {//当子线程send的时候触发此方法
            console.log(child_process.pid+'的时间：'+m.time+',质数个数为：'+m.total);
        });
        child_process.send({time:i});//给子线程传递参数
    }
    let end = new Date().getTime();
    console.log('start server ...'+(end-start));
}



##child.js

//判断一个数是不是质数
function zhishu_js(num) {
    if (num == 1) {
        return false;
    }
    if (num == 2) {
        return true;
    }
    for (var i = 2; i <= Math.sqrt(num); i++) {
        if (num % i == 0) {
            return false;
        }
    }
    return true;
}
let time = 1;

//测试一共需要多长时间
//test();
function test() {
    let total = 0;
    let start = new Date().getTime();
    for(let i = 1;i<400000;i++){
        if(zhishu_js(i)){
            total+=1;
        }
    }
    let end = new Date().getTime();
    console.log('total time  ='+(end - start)+'total = '+total);
}

//接受主线程中线程传递进来的参数
process.on('message',function (message) {
    let total = 0;
    time = message.time*100000;
    console.log('message:'+time);
    let start = new Date().getTime();
    let i = time+100000;
    for(time;time<i;time++){
        if(zhishu_js(time)){
            total++;
        }
    }
    let end = new Date().getTime();
    process.send({time:(end-start),total:total});
});