One of the main bottlenecks when downloading and seeding content over bittorrent is accessing the disk. This post explores the option to bypass traditional filesystems and use a block device as storage for torrents, in order to improve download performance. bittorrent protocol BitTorrent downloads conceptually divide up content into pieces, which are downloaded in rarest-first order. . . .
Since 2010, I’ve been working, on and off, on a branch off of libtorrent which use asynchronous disk I/O, instead of the synchronous disk calls in the disk thread in 0.16.x versions. The aio branch has several performance improvements apart from allowing multiple disk operations outstanding at any given time. For instance: the disk cache allows multiple threads . . .
A long standing problem with bittorrent clients on windows is that if you’re seeding large files or downloading large files, windows may decide to essentially use all your physical RAM for disk cache. The disk cache grows to the point where running processes start having their working set swapped out, significantly slowing down the system . . .