Support for sendfile(2)

[andoriyu]

Is there way to send large files via reel? I know i should be using nginx for this, but it's an overkill for what I do.

[tarcieri]

Reel use Celluloid::IO.copy_stream to render IO objects:

https://github.com/celluloid/reel/blob/master/lib/reel/response/writer.rb#L33

However, this presently thunks through userspace to send files. We thunked to native ::IO.copy_stream in the past running in a background thread. I forget what the issue was.

If this is really posing a practical problem, please open an issue on Celluloid::IO.