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POHow to handle up to 100k HTTP connections in .Net
 

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  1. POHow to handle up to 100k HTTP connections in .Net
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    <p>I am creating a server to monitor the online presence of clients on a webpage.</p> <ul> <li>There will be 80-100 000 (eighty thousand) simultaneous clients to monitor.</li> <li>I’m using .Net to write this.</li> </ul> <p>Clients will contact a (separate) server using JavaScript (on the HTML-page) to tell the server that they are alive/online.</p> <p>I’m considering one of two approaches:</p> <ol> <li><p>Persistent connections with keep-alive sent regularly. This will give me much higher precision on when clients disconnect and I don’t need to update memory structure (onlineinfo) too often because we know when client comes and goes. Additional benefits to network equipment / bandwidth.</p></li> <li><p>Clients (re)connect at intervals to tell server they are alive. This requires a lot of connections and will necessarily decrease the accuracy. I imagine intervals like 2-3 minutes is the best we can do. 80k/120=660 connections per second… ASP.Net don’t execute too fast so I’m unsure about this. 8 core system = ~10 ms per execution.</p></li> </ol> <p>With this many connections there are obviously some limitations. I can’t spawn that many threads simultaneously for instance. 1 request to IIS spawning an ASP.Net application will use 1 thread until request is done.</p> <p>Is the best option to write a stand-alone http-server? Doesn’t .Nets TcpListener leverage httpd.sys (IIS)?</p> <p>Any (constructive) thoughts on the subject would be appreciated.</p> <p><strong>Edit: Adding some useful links to this post found by following links from Nicolas Repiquets answer:</strong></p> <ul> <li><a href="http://msdn.microsoft.com/en-us/magazine/cc300760.aspx" rel="nofollow noreferrer">Get Closer to the Wire with High-Performance Sockets in .NET</a></li> <li><a href="https://stackoverflow.com/questions/319732/tips-techniques-for-high-performance-c-server-sockets">Tips / techniques for high-performance C# server sockets</a></li> <li><a href="http://www.codeproject.com/KB/IP/high-performance-server.aspx" rel="nofollow noreferrer">High Performance TCP/IP Server using C#.NET</a></li> </ul>
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    1. COJusta thought - Have you considered a load balancing strategy for this with multiple servers?
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    2. COAs long as the clients don't require much processing for each keep-alive "request", I see no reason you shouldn't be able to do this.
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    3. COInteresting problem! The only thing that I could advise you is that you are playing with .NET and TCP/IP limits. Whatever solution you implement, think at first how to Scale Out. (divide the load into multiple servers)
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      1. USGerardo Grignoli
 

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