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    <p>I believe the issue revolves around sinatra-sse's <a href="https://github.com/radiospiel/sinatra-sse/blob/master/lib/sinatra/sse.rb#L67" rel="nofollow noreferrer">explicit use</a> of the EventMachine library, which it <a href="https://github.com/radiospiel/sinatra-sse/blob/master/sinatra-sse.gemspec#L18-L19" rel="nofollow noreferrer">does not list as a dependency</a>. It does, however, list Thin in its <a href="https://github.com/radiospiel/sinatra-sse/blob/master/Gemfile#L10" rel="nofollow noreferrer">Gemfile</a> and EventMachine is a core dependency of <a href="https://github.com/macournoyer/thin/blob/master/thin.gemspec#L23" rel="nofollow noreferrer">Thin</a>. </p> <p>Puma's concurrency model is <a href="https://github.com/puma/puma#description" rel="nofollow noreferrer">quite different</a>. In fact, you'll find the following statement right at the top of the project's <a href="https://github.com/puma/puma/blob/master/README.md" rel="nofollow noreferrer">README</a>:</p> <blockquote> <p>Puma still improves MRI's throughput by allowing blocking IO to be run concurrently (EventMachine-based servers such as Thin turn off this ability, requiring you to use special libraries).</p> </blockquote> <p><strong>EDIT</strong></p> <p>If you're interested in learning more about Rack, Rails, Puma, and SSE, you might enjoy <a href="http://tenderlovemaking.com/2012/07/30/is-it-live.html" rel="nofollow noreferrer">this great blog post</a> by Aaron Patterson, a Ruby/Rails core member and all-around swell guy.</p>
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    1. USEzekiel Templin
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    1. COWell, my application uses EventMachine as well, so I don't think this is caused by EventMachine not running. Also that particular line you linked seems to be used only to keep the connection open for when there's no data sent. My application sends a generous amount of data regularly, so I don't think that has anything to do with it :/
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      1. USIlya O.
    2. CO@IlyaO. Just edited my answer with a link to a Puma github issue outlining the roadblocks for a Puma implementation of async.callback.
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    3. COJust gave the ticket a bump. I'll give you the bounty if nobody else has anything to add.
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