What memory is wget missing?

Question

Wget

Good day to all!
I download via the console server using wget files via http. On a 3.7 GB file, wget crashes and says "wget: not enough memory". More precisely, it pumps it out completely to 100% (judging by the logs), freezes for a couple of seconds, and then dies.

$ df -h
/dev/vda2          124G          35G   84G           30% /
---
$ free -h
              total        used        free      shared  buff/cache   available
Mem:           2,0G         99M         78M        1,4M        1,8G        1,7G
Swap:          1,0G        100M        923M

What's the catch?

Answer 1

Successfully downloading large files using wget with the "--mirror" option requires a swap larger than the file being downloaded.
Empirically tested.
Given:
Hypervisor Proxmox 5.1;
Virtual machine (2 GB RAM, 40 GB root, 2 to 10 GB swap);
Debian Stretch 9.8;
wget 1.18.
For lxc without swap with the same options, wget downloads files without errors.