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The term was coined in 1999 by '''Dan Kegel''',{{r|aosa2:nginx}}<ref name = "Dan Kegel, kegel.com, 1999" /> citing the [[Simtel]] FTP host, [[cdrom.com]], serving 10,000 clients at once over 1 [[gigabit per second]] [[Ethernet]] in that year.<ref name="C10K" /> The term has since been used for the general issue of large number of clients, with similar numeronyms for larger number of connections, most recently "C10M" in the 2010s.<ref name=":0" />
By the early 2010s millions of connections on a single commodity 1U 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 | format = html | 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 | format = pdf | 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=":0">[https://mrotaru.wordpress.com/2015/05/20/how-migratorydata-solved-the-c10m-problem-10-million-concurrent-connections-on-a-single-commodity-server/ How MigratoryData solved the C10M problem: 10 Million Concurrent Connections on a Single Commodity Server]</ref><ref>[https://mrotaru.wordpress.com/2013/10/10/scaling-to-12-million-concurrent-connections-how-migratorydata-did-it/ Scaling to 12 Million Concurrent Connections: How MigratoryData Did It]</ref>
Common applications of very high number of connections include pub/sub servers, chat, file servers, web servers, and software-defined networking.{{citation needed|reason=examples given are non-obvious and need justification.|date=July 2015}}
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