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    <p>It depends. It depends on lots of things you didn't specify or define, and I suspect that if you specified enough that a "real" answer was possible you would be disappointed because it wouldn't be useful. That's why these sorts of questions are generally discouraged.</p> <p>You don't say what date range you mean by "when these old telecoms used Erlang". They still use it (it's never had traction outside of Ericsson and there was never a time when Ericsson used it significantly more than the present). Here's a video of them talking about using Erlang on their <a href="http://www.ericsson.com/ourportfolio/products/sgsn-mme" rel="nofollow">SGSN-MME</a>: <a href="http://vimeo.com/44718243" rel="nofollow">http://vimeo.com/44718243</a></p> <p>You don't say what you mean by "an Erlang system". Is that a single machine? Erlang did not have SMP support when it started (is that the time frame you're asking about?). Do you mean concurrent processes?</p> <p>Is that a single cluster using <code>net_kernel:connect_node/1</code>? How are you defining a cluster? Erlang clusters, by default, are a complete mesh. That limits the maximum size based on the performance limits of the network and the machine's interfaces. But you can connect nodes in a chain and then there's no limit. But if you count that as a cluster, why not count it when you use your own TCP connections instead of just net_kernel's. There are lots of Ericsson routers in use on the Internet, so we could think of the Internet as one "system" where many of its component routers are using Erlang.</p> <p>In the video I linked, you can see that in the early 2000s, Ericsson's SGSN product was a single box (containing multiple machines) that could serve maybe a few thousand mobile phones simultaneously. We might assume that each connected phone had one Erlang process managing it, plus a negligible number of system processes.</p>
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    1. POErlang concurrency/distribution - then vs. now
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    1. USNathaniel Waisbrot
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