CODEWITHSUNDEEP
node.jsv8
Dmitriy Simushev
Dmitriy Simushev

Reputation: 308

How can I get maximum Buffer size in Node.js

In Node.js 0.12.x maximum size of the buffer was limited by allocatable memory, which size could be got with:

require('smalloc').kMaxLength;

The actual value of kMaxLength was hardcoded in old versions of V8 and was equal to 0x3fffffff.

The problem is there is no smalloc module in io.js >=3.x (including node.js 4.x). It was mentioned that Buffer implementation was rewritten in V8 4.4.x.

So, my question is: is there a way to get the maximum size of the Buffer (and/or allocatable memory) in io.js >= 3.x ?

Upvotes: 0

Views: 1520

Answers (1)

Andriy Kuba
Andriy Kuba

Reputation: 8263

This file "calculated" (https://github.com/v8/v8-git-mirror/blob/4.4.63/src/objects.h) also has fixed constant for the external array. 

4642 // Maximal acceptable length for an external array.
4643  static const int kMaxLength = 0x3fffffff;

EDIT:

It looks like you can use require('buffer').kMaxLength;

That was the change in 3.0 and still in 4.0

b625ab4242 - buffer: fix usage of kMaxLength (Trevor Norris) #2003

Upvotes: 2

Related Questions