node.js - mongodb中数据find出来，提示process out of memory，数据大小并没有超过NodeJS默认的512MB

使用mongoose从数据库中一次性find出数据，提示：

但是我查了default the memory limit of Node.js is 512 mb，我的数据集合大小只有127MB，并没有超过这个大小，也不需要设置--max_old_space_size吧，求解

代码如下：

//model.js
var LagouInfo = require('./schema.js')
var DesData = require('./des.js');
var async = require('async');

LagouInfo.find({}, function(res){
    res.forEach(function(item){
        if(item.content.trim()){
            var sumSalary = 0;
            item.salary.forEach(function(sitem){
                var num;
                if(sitem.indexOf('-') == -1){
                    num = sitem.replace(/\D+/, '');
                }else{
                    num = parseInt(sitem.trim().split('-')[1]);
                }
                // console.log(sitem, num);
                sumSalary += num;
            })
            var tags = item.tag.trim().split(',');
            tags.forEach(function(tag){
                DesData.update({'tag': tag}, {$push: {'content': item.content}});
                DesData.update({'tag': tag}, {$inc: {'total': item.total}});
                DesData.update({'tag': tag}, {$inc:{'salary': sumSalary}});
            })

        }
    })
})

//des.js
var mongoose = require('./db.js'),
    Schema = mongoose.Schema;

var InfoSchema = new Schema({          
    tag: {type: String},
    content: {type: Array},
    total: {type: Number},
    salary: {type: Number},     
});
var Data = mongoose.model('desdata', InfoSchema, 'desdata');
function insert(obj, callback){
    var data = new Data(obj);
    data.save(function(err, res){
        if(err) console.log('Error:' + err);
        else callback(null, res);
    })
}
function update(conditions, updateStr){
    Data.update(conditions, updateStr, function(err, res){
        if(err) console.log('Error:' + err);
        else console.log('Update Success');
        // else callback(null, res);
    })
}
function find(conditions, callback){
    Data.find(conditions, function(err, res){
        if(err) console.log('Error:' + err);
        else callback(res);
    })
    // return Data.find(conditions).exec();
}
module.exports = {
    insert: insert,
    update: update,
    find: find
}

//schema.js
var mongoose = require('./db.js'),
    Schema = mongoose.Schema;
var LagouSchema = new Schema({
    name: {type: String},
    cid: {type: Number},
    process: {type: String},
    content: {type: String},
    url: {type: String},
    tag: {type: String},
    total: {type: Number},
    salary: {type: Array}
});
var Lagou = mongoose.model('lagou', LagouSchema, 'lagou');

function update(conditions, update){
    Lagou.update(conditions, update, function(err, res){
        if(err) console.log('Error:' + err);
        else console.log('Res:' + res);
    })
}
function del(conditions){
    Lagou.remove(conditions, function(err, res){
        if(err) console.log('Error:' + err);
        else console.log('Res:' + res);
    })
}
function find(conditions, callback){
    Lagou.find(conditions, function(err, res){
        if(err) console.log('Error:' + err);
        else callback(res);
    })
}
module.exports = {
    find: find,
    del: del,
    update: update
}

//db.js
var mongoose = require('mongoose'),
    DB_URL = 'mongodb://localhost:27017/result';

mongoose.Promise = global.Promise;
mongoose.connect(DB_URL);
//连接成功
mongoose.connection.on('connected', function(){
    console.log('Mongoose connection open to ' + DB_URL);
})
//连接异常
mongoose.connection.on('error', function(err){
    console.log('Mongoose connection error: ' + err);
})
//连接断开
mongoose.connection.on('disconnected', function(){
    console.log('Mongoose connection disconnected');
})

module.exports = mongoose;

============更新2017-01-12===================

尝试设置了--max_old_space_size还是报错

报错内容：

$ node --max_old_space_size=2000 models/test.js
Mongoose connection open to mongodb://localhost:27017/result

<--- Last few GCs --->

  251717 ms: Mark-sweep 1989.2 (2067.0) -> 1989.3 (2067.0) MB, 1564.0 / 0 ms [allocation failure] [scavenge might not succeed].
  253271 ms: Mark-sweep 1989.3 (2067.0) -> 1989.2 (2067.0) MB, 1554.2 / 0 ms [allocation failure] [scavenge might not succeed].
  254868 ms: Mark-sweep 1989.2 (2067.0) -> 1989.3 (2067.0) MB, 1597.0 / 0 ms [last resort gc].
  256434 ms: Mark-sweep 1989.3 (2067.0) -> 1989.2 (2067.0) MB, 1566.2 / 0 ms [last resort gc].


<--- JS stacktrace --->

==== JS stack trace =========================================

Security context: 00000394003B4639 <JS Object>
    2: /* anonymous */(aka /* anonymous */) [D:\software\self_learn\Paper\preprocess\node_modules\mongodb-core\lib\connection\pool.js:~1096] [
pc=000002BA3DA6C022] (this=00000394003041B9 <undefined>)
    3: waitForAuth(aka waitForAuth) [D:\software\self_learn\Paper\preprocess\node_modules\mongodb-core\lib\connection\pool.js:1088] [pc=000002
BA41DE1FBC] (this=00000394003041B9 <undefined>,cb=0000...

FATAL ERROR: CALL_AND_RETRY_LAST Allocation failed - process out of memory

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node.js - mongodb中数据find出来，提示process out of memory，数据大小并没有超过NodeJS默认的512MB

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