Celluloid concurrency doesn't parallelize the connection setup

[dblock]

Celluloid creates an Actor which then performs a connection. Even if you put this inside a Celluloid.defer (as I did in dblock/slack-market@3635cdd) it doesn't seem to happen in parallel, build_socket is blocking. This causes server start with lots of connections to be very slow, as we create TCP connections one-at-a-time.

[dblock]

@mikz Maybe you can help with this?

[dblock]

I also asked https://groups.google.com/forum/#!topic/celluloid-ruby/Xa8pdXP3h4A.

[mikz]

I have not worked with Celluloid enough to get this problem.

The connect is happening synchronously iirc.
That part could be wrapped in some actor, but then the status could not be immediate and would have to use Future.

[dblock]

@mikz I thought that using Celluloid.defer around this would do it, but I couldn't make it happen in parallel.

[dblock]

Fixed in dblock@e4edaca.