I remember reading around 2002-2004 about a sysadmin managing a very large “supernode” p2p server who was able to fine-tune its Linux kernel, and to recompile an optimized version of the p2p app (to allocate data structures as small as possible for each client) to support up to one million concurrent TCP connections. It wasn’t a test system, it was a production server routinely reaching this many connection at its daily peak.
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