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By the early 2010s millions of connections on a single commodity 1U rackmount server became possible: over 2 million connections ([[WhatsApp]], 24 cores, using [[Erlang (programming language)|Erlang]] on [[FreeBSD]]),<ref name = "WhatsApp blog, 2012" > {{ Cite web | url = https://blog.whatsapp.com/196/1-million-is-so-2011 | title = 1 million is so 2011 | access-date = 25 July 2019 | date = 6 January 2012 | website = [[WhatsApp]] blog | quote = This time we also wanted to share some more technical details with you about hardware, OS and software: hw.machine: amd64 hw.model: Intel(R) Xeon(R) CPU X5675 @ 3.07GHz hw.ncpu: 24 hw.physmem: 103062118400 hw.usermem: 100556451840 | archive-url = https://web.archive.org/web/20140501234954/https://blog.whatsapp.com/196/1-million-is-so-2011 | archive-date = 1 May 2014 | df = dmy-all }} </ref><ref name = "Reed, Erlang Factory, 2012" > {{ Cite web | url = http://www.erlang-factory.com/upload/presentations/558/efsf2012-whatsapp-scaling.pdf | title = Scaling to Millions of Simultaneous Connections | access-date = 25 July 2019 | first = Rick | last = Reed | date = 30 March 2012 | website = Erlang Factory | page = 7 | archive-url = https://web.archive.org/web/20120709235656/http://www.erlang-factory.com/upload/presentations/558/efsf2012-whatsapp-scaling.pdf | archive-date = 9 July 2012 | df = dmy-all }} </ref> 10–12 million connections (MigratoryData, 12 cores, using [[Java (Programming language)|Java]] on [[Linux]]).<ref name="C10M" /><ref name="C10M-howto">{{Cite web|url=https://migratorydata.com/blog/migratorydata-with-12-million-concurrent-websockets/|title=Scaling to 12 Million Concurrent Connections: How MigratoryData Did It|website=migratorydata.com|language=en|date=2013-10-10|access-date=2021-10-15|author=Mihai Rotaru}}</ref>
Common applications of very high number of connections include general public servers, or private servers of very big companies whose sparse offices are connected to those servers via their [[virtual private network]]s, that have to serve thousands or even millions of users at a time, such as [[file server]]s, [[FTP server]]s, [[proxy servers]], web servers, [[Load balancing (computing)|load balancers]], and so on.<ref name="conn-very-high-file">{{Cite book|url=https://
== See also ==
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