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> The networking stack has also handily beat Linux for as long as I can remember.

None of the TOP500 use FreeBSD [1]. I would have thought this would be a primary consideration for a supercomputer. Most of them are using Linux (99.6%!).

1. https://www.top500.org/statistics/details/osfam/4

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HPC generally doesn't use IP, so they're using Linux but not the Linux network stack.

Yeah I don't see FreeBSD entering the HPC market ever, except maybe for I/O nodes. Nothing explicitly wrong with that, you have to choose battles.

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