what is best solution for managing heap size for node.js

We are going to analysis on twitter data so for this we will use node but the issue we are facing is that older versions of v8 chrome engine didn't provide heap size more than 1.9 gb on 64 bit (Our colleagues did analysis on amazon data and they faced this problem and they overcame this problem using distributed computing but this is not a good solution).

How much heap size 64 bit V8 chrome engine officially giving us nowadays.

What is the best solution for it?

We have been searching for lot of articles and solutions over the internet. Is io.js suitable for such tasks?