The default max memory size of V8 is 2GB:
$ node
> v8.getHeapStatistics()
{
....
heap_size_limit: 2197815296,
...
}
2197815296 is 2GB in bytes. When set NODE_OPTIONS=--max_old_space_size=8192, heap_size_limit will be 8G or 8640266240 bytes.
$ NODE_OPTIONS=--max_old_space_size=8192 node
> v8.getHeapStatistics()
{
....
heap_size_limit: 8640266240,
...
}
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