nodejs，socket.io简单代码内存泄漏 [英] nodejs , socket.io simple code memory leak

问题描述

我使用nodejs和socket.io为一个简单的套接字应用程序编写了下面的代码(只需connect和断开连接)，大约50个用户的内存使用量并没有太大变化，但是最多300个用户，一个小时后，内存使用量仅为长大(server.js进程接近300MB并随着时间的流逝而增长)，看来nodejs不会释放内存.

i wrote code bellow using nodejs And socket.io for a simple socket application (just connect and disconnect ), for about 50 user memory usage not change to much , but for up to 300 user and after one hour , memory usage just grow up ( near 300MB for server.js proccess and grows by time pass ) , it's look like that nodejs don't release memory.

var server = require('http').createServer();
var io = require('socket.io')(server);
var port = 9090;
var sockets = {};

server.listen(port, function () {
    console.log('Server listening at port ', port);
    //timer and logs are not problem , i tested it before.
    setInterval(function(){
      console.log(Object.keys(sockets).length+' Online Devices At '+Date());
    }, 1000 * 60 * 1); 
});

io.on('connection',function(socket){
    sockets[socket.id]={id:socket.id};
    console.log('connected '+socket.id + ' count ' + Object.keys(sockets).length);
    socket.on('disconnect', function (data) {
        delete sockets[socket.id];
        console.log('disconnected '+socket.id+ ' count ' +Object.keys(sockets).length);
    });
});

我做错了什么吗?！

修改

使用forever启动文件后的14小时

14 hours after starting file with forever

300个开放的套接字以及大约500MB的内存使用量，这与我的nodejs进程有关.

300 open sockets And About 500MB of memory usage that is related to my nodejs proccess.

修改

16小时后，连接了300个插座 进程停止后.

After 16 Hours , 300 Connected Sockets After process stopped.

ٍ编辑

请掠夺我的新代码.

var server = require('http').createServer();
var io = require('socket.io')(server);
var port = 90;
var counter = 0;
var clients = {}
server.listen(port, function () {
        console.log('Server listening at port ', port);
});
io.on("connection",function(socket){
        clients[socket.id] = socket;
        counter++;

        socket.on('disconnect', function (data) {
                counter--;
                delete clients[socket.id];
        });
});

我正在与1000个已连接用户进行尝试(另一台服务器正在模拟用户请求并打开套接字)

i am trying this with 1000 connected user ( another server is simulate user requests and open sockets )

开始前的内存使用量:100MB， 5分钟后和1000个稳定的打开连接后:400MB

memory usage before start :100MB , after 5 minutes and 1000 stable open connections : 400MB

推荐答案

在释放未使用的内存时，V8是惰性的，因此当V8实际上不运行其垃圾回收器时，它看起来就像是内存泄漏.要查看是否是这种情况，请在--expose-gc标志设置为例如

V8 is lazy when it comes to freeing up unused memory, so it may look like a memory leak when it is actually just V8 not running its garbage collector. To see if this is the case, run your process with the --expose-gc flag set e.g.

node --expose-gc yourscript.js

并强制间隔一定时间(我使用30秒间隔)进行手动垃圾收集.

And force manual garbage collection on an interval (I used 30 second interval).

setInterval(function(){
  global.gc();
  console.log('GC done')
}, 1000*30);

这篇关于nodejs，socket.io简单代码内存泄漏的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！