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POHow can I know if socketIO will offer any benefit over long-polling?
 

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  1. POHow can I know if socketIO will offer any benefit over long-polling?
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    <p>I recently inherited a PHP application using the CodeIgniter framework - which handles authentication, user sessions, CRUD operations, routing, templating, and pretty much all aspects of the application just beautifully. However, one feature requires the use of long-polling. Certain admins need near real-time updates on what other users are doing. Everything is working fine now for a few hundred users, but we're scaling up to support a few thousand, and I'm worried the long-polling will cause some performance issues.</p> <p>Here's the basics of the long-poll process:</p> <ol> <li><p>The browser makes a GET request which kicks off the long-poll process.</p></li> <li><p>The long-poll process checks the timestamp of a txt file every 1/4 seconds.</p></li> <li><p>a) If the txt file is updated, the long-poll process returns the changes to the browser and the view is updated.</p> <p>b) If no changes are found in 25 seconds, the long-poll ends and returns null.</p></li> <li><p>Repeat step 1.</p></li> </ol> <p>This process takes place outside of the codeigniter framework. I'm thinking that it's a good idea to replace this process with a socket.io implementation. </p> <p>Will socket.io be a better solution than the long-polling? If so, what convincing evidence do I have without actually building a demo and doing load testing? It seems like a good idea in my head, but I need to justify the time and effort to make the switch.</p> <p>Also, sorry if this doesn't make sense, or 'is not a real question' by SO standards. I'm pretty new to back-end scalability and most of this stuff is brand new to me. Please offer helpful guidance for rewording (if needed) before downvoting. Thanks.</p> <p>EDIT: The preference here is to keep things as-is, because it's expensive to rip out code and replace it with new things, especially when new things are untested. So I guess my question is, when/if the long-polling solution hits a brick wall, will socket.io be a viable replacement?</p>
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      1. POHow can I know if socketIO will offer any benefit over long-polling?
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    1. COI guess the many server threads polling the file is the major pain here, not the idle TCP connections.
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    2. COPHP's `filemtime` function is used to poll the files. It doesn't seem to be very CPU intensive at this point, but at scale?
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