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A comment on Ejabberd Massive Scalability: 1 Node – 2+ Million Concurrent Users. Parent comment

Re:Ejabberd Massive Scalability: 1 Node – 2+ Million Concurr... by tostitos1979 on Wednesday January 20, 2016 @06:01PM (#10942076)
I suggest you look for slides from the Whatsapp folks on the kernel and Beam vm tuning they did to get similar numbers. Don't have the link handy but fairly easy to find.

What is more problematic IMHO is generating the load to saturate said server.

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Re:Ejabberd Massive Scalability: 1 Node – 2+ Million Concurr... by davidw on Wednesday January 20, 2016 @06:21PM (#10942220)
IIRC, the Whatsapp folks use FreeBSD.
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Re:Ejabberd Massive Scalability: 1 Node – 2+ Million Concurr... by mickael on Thursday January 21, 2016 @03:11AM (#10944018)
We manage to load the server properly with Tsung (https://github.com/processone/tsung) but for a more heavy load we may need to add one more Tsung server.
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