How can I create an array with 200 million elements on NodeJs?

Question

To do some benchmarking, I tried to create a huge array. The code was simple:

var hugeArray = [];
for (var i = 0; i < 2*1000*1000*100; i ++) {
    hugeArray.push(Math.ceil(Math.random()*100))
}
console.log(hugeArray.length);

After I run it with 200 million elements, I get FATAL ERROR: invalid array length Allocation failed - JavaScript heap out of memory. With 20 million elements, this works well, so I assume I need to change some setting.

I am using MacOS with 8 GB of RAM, if that helps.

score 7 · Accepted Answer · answered Sep 17 '16 at 18:53

7

V8's heap size is limited to 1 GB..So if you want to increase it run following

node --max-old-space-size=8000 yourScript.js

Hope this helps.

answered Sep 17 '16 at 18:53

Mykola Borysyuk

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Thank you kindly. – Alberto Rivera Sep 17 '16 at 18:54
No problem. Glad this helps. – Mykola Borysyuk Sep 17 '16 at 18:54
Can we increase the value more? or 8000 is the limit ? – user3304007 Jan 10 '17 at 00:13
You can increase as much as your system can offer to you ...32 or 64 GB.etc. – Mykola Borysyuk Jan 10 '17 at 14:24

How can I create an array with 200 million elements on NodeJs?

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