Javascript object maxium memory size

Question

Currently i am doing a simple db migration through Javascript. I find myself wanting to keep track of some simple id -> object maps to make less SQL db calls.

So the question is, what is the maximum size of a javascript object in node? Say i have a very simple table with 2000 records. I am only interested in two columns, is it possible for me to just store all these values under a plain JS object that looks like {id1: {col1: "foo", col2: "bar"}, id2: {col1: "ss", col2: "bb"}} ??

If 2000 is okay, what is the maximum that i can do?

It obviously depends on browser implementation

vp_arth
– vp_arth

2016-05-20 04:41:04 +00:00
Commented May 20, 2016 at 4:41 — vp_arth
– vp_arth, Commented May 20, 2016 at 4:41
Why don't you just test it?

user663031
– user663031

2016-05-20 06:01:45 +00:00
Commented May 20, 2016 at 6:01 — user663031
– user663031, Commented May 20, 2016 at 6:01
@vp_arth I was talking about node.

Zhen Liu
– Zhen Liu

2016-05-20 15:23:45 +00:00
Commented May 20, 2016 at 15:23 — Zhen Liu
– Zhen Liu, Commented May 20, 2016 at 15:23
read browser as engine

vp_arth
– vp_arth

2016-05-20 15:27:33 +00:00
Commented May 20, 2016 at 15:27 — vp_arth
– vp_arth, Commented May 20, 2016 at 15:27

Mekal · Accepted Answer · 2016-05-20 04:48:53Z

4

It's NO PROBLEM

In my app, I just store some logs in an Array instance and set a length limit of 10000;

var maxListLength = 100000; This make the Array instance size reach to 50MB more or less;

And when the app is running, there may be 100 of this kind of instance, but with no problem;

What should you do is to increase memory limit for Node process in V8:

node --max-old-space-size=4096 your_app.js

answered May 20, 2016 at 4:48

Mekal

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Zhen Liu Over a year ago

Thanks you've answered my question - although i can't change the --max-old-space-size stuff, i think i know what the limit is now.

KuN · Accepted Answer · 2016-05-20 04:43:16Z

2

According to this issue on V8. Chrome can support no more than 2GB of object in memory.

https://bugs.chromium.org/p/v8/issues/detail?id=847

answered May 20, 2016 at 4:43

KuN

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1 Comment

KuN Over a year ago

it does slow down and eventually freeze once the total memory usage reaches around 2GB. At least it was when i was doing pressure test on a large scale data visualization project in August 2017.

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