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The source of qBittorent can be viewed here: https://github.com/qbittorrent/qBittorrent
Looking at the code of libtorrent, used internally by most BitTorrent clients, it seems to use either mmap (when available) or ordinary blocking file I/O otherwise -- and there's a thread pool for I/O operations so that more than one can be happening at once. The size of the files isn't actually a problem for memory mapping unless you're using 32 bit pointers, which limits your address space.
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Hence, a higher number means a more popular project.