How to completely deallocate a hashmap

[seven7777777]

I have a map type robin_hood::unordered_map<uint64_t, uint64_t>, and I insert more than 200 million kv pair into map, but it just does not release any memory to os when I destroy the map object.

[martinus]

That's a bit tricky because the map tries to keep the memory so it doesn't have to allocate any more, but you can do it like this:

robin_hood::unordered_map<uint64_t, uint64_t>().swap(yourMap);

[martinus]

Edit: wait a minute, do you mean it does not deallocate even when you destroy the map?

[martinus]

closing, cannot reproduce