Re: [Cppcms-users] CppCMS as Comet Server
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Re: [Cppcms-users] CppCMS as Comet Server
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From: Artyom B. <art...@ya...> - 2012-12-28 17:50:35
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>________________________________ > From: william lee <we...@gm...> >To: Artyom Beilis <art...@ya...>; cpp...@li... >Sent: Friday, December 28, 2012 3:07 AM >Subject: Re: [Cppcms-users] CppCMS as Comet Server > > >wow. you do benchmark on a laptop? :) Yep >Thanks for the detailed reply, and here is another reference I read about: > > >http://webcache.googleusercontent.com/search?q=cache:2iV4meP2vIMJ:blog.urbanairship.com/blog/2010/09/29/linux-kernel-tuning-for-c500k/+&cd=1&hl=en&ct=clnk&gl=us > > > >It mentioned C65K Myth. > Yes, you are right I've got little bit confused, however it is still hard to benchmark more then 20K concurrent requests as you need many clients on different ip addresses. > >Actually I expect more connection than that. >The more connection I can have per server, the less cost it will be. > So plan it as scalable application and use multiple processes. prefork would work better with many concurrent connections. In any case I don't see specific restrictions given enough memory and configures OS. > >I will try and see how it comes :) > Tell us how did it worked out :-) Artyom Beilis -------------- CppCMS - C++ Web Framework: http://cppcms.com/ CppDB - C++ SQL Connectivity: http://cppcms.com/sql/cppdb/ > >thanks, >William L. > > > >On Fri, Dec 28, 2012 at 5:54 AM, Artyom Beilis <art...@ya...> wrote: > >Actually it is very good questions... >> >> >>What is the performance, I did some benchmarks but had not full time to publish them... >> >> >>In general I could easily handle 20,000 connections and send updates (SSE) using vanila CppCMS code >>and broadcast around 50,000 messages per second (i.e. each connection 2.5 msg/s) >> >> >>Having 200-500 connections I could send about 100,000 messages per second. >> >> >>This was done using the most stright forward implementation using event-stream API I had written about it in the blog. >> >> >>Now to handle more than 20,000 K connections you need more network interfaces (ips) (as TCP/IP can't handle theoretically more than 65K connections in single IP address) which i couldn't check. >> >> >>Now when you deal with Comet everything is handled in currently single event loop one thread. So to scale up today the >>easiest is to use prefork mode (more then 1 worker process see service.worker_processes) >>thus you would have several event loops and you can scale them >>over multiple CPUs. It would be slower for low loads for much better for high onces. >> >> >>For example using 20,000 connections I could send 120,000 msgs/s i.e. 6/msg per connection which was quite liner scale up over CPUs on this particular machine. >> >> >>However using prefork with comet would require IPC so you would need to notify somehow each process on event, but it is must to >>have to scale over multiple CPUs and especially over multiple hosts. >> >> >>Also in general such benchmarking requires: >> >> >>- Tuning TCP/IP stack, make big backlog - very important and setting appropriate backlog option in application, also make sure you have wide port range, etc. >>- Ensure you have high ulimits to handle many descriptors >> >> >>Also I should note that I expect to do some optimization in CppCMS 1.2 to increase these numbers after some extensive profiling I did >>(there is lots of space for improvement) >> >> >>All these numbers I got running on Laptop with i5 2.4 GHz 2 cores 4 threads 4GB RAM (of wich I used quite a few) >> >> >> >> >>Regards >> >> >> >>Artyom Beilis >>-------------- >>CppCMS - C++ Web Framework: http://cppcms.com/ >>CppDB - C++ SQL Connectivity: http://cppcms.com/sql/cppdb/ >> >> >> >>>________________________________ >>> From: william lee <we...@gm...> >>>To: cpp...@li... >>>Sent: Thursday, December 27, 2012 4:22 PM >>>Subject: [Cppcms-users] CppCMS as Comet Server >>> >>> >>> >>>Hi, >>>I'm thinking of using CppCMS to implement a Comet Server for Pushing short messages to connected users via Http. >>> >>> >>>Do you have any ideas from performance perspective, how much connections CppCMS application can handle at the same time per server? >>> >>> >>>The server spec is like 10G RAM, 8Core CPU etc, and http traffic is not heavy, I'm thinking about keep a connection for 10 mins then release it and let it reconnect back. >>> >>> >>>If anyone have some benchmark result, that will be great! >>> >>> >>>Thanks and appreciated >>> >>> >>>Happy New Year >>>William L. >>>------------------------------------------------------------------------------ >>>Master Visual Studio, SharePoint, SQL, ASP.NET, C# 2012, HTML5, CSS, >>>MVC, Windows 8 Apps, JavaScript and much more. Keep your skills current >>>with LearnDevNow - 3,200 step-by-step video tutorials by Microsoft >>>MVPs and experts. ON SALE this month only -- learn more at: >>>http://p.sf.net/sfu/learnmore_122712 >>>_______________________________________________ >>>Cppcms-users mailing list >>>Cpp...@li... >>>https://lists.sourceforge.net/lists/listinfo/cppcms-users >>> >>> >>> >>------------------------------------------------------------------------------ >>Master Visual Studio, SharePoint, SQL, ASP.NET, C# 2012, HTML5, CSS, >>MVC, Windows 8 Apps, JavaScript and much more. Keep your skills current >>with LearnDevNow - 3,200 step-by-step video tutorials by Microsoft >>MVPs and experts. ON SALE this month only -- learn more at: >>http://p.sf.net/sfu/learnmore_122712 >>_______________________________________________ >>Cppcms-users mailing list >>Cpp...@li... >>https://lists.sourceforge.net/lists/listinfo/cppcms-users >> >> > >------------------------------------------------------------------------------ >Master HTML5, CSS3, ASP.NET, MVC, AJAX, Knockout.js, Web API and >much more. Get web development skills now with LearnDevNow - >350+ hours of step-by-step video tutorials by Microsoft MVPs and experts. >SALE $99.99 this month only -- learn more at: >http://p.sf.net/sfu/learnmore_122812 >_______________________________________________ >Cppcms-users mailing list >Cpp...@li... >https://lists.sourceforge.net/lists/listinfo/cppcms-users > > > |
