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[[!tag open_issue_glibc open_issue_hurd]]
On Unix systems, `fork` is a rather simple system call. Our implementation in
[[glibc]] is / needs to be rather bulky. TODO: elaborate.
This affects performance when new processes are continuously being spawned from
the shell, for example.
Alternatives: use `posix_spawn`. Others?
To do: hard numbers.
[[Microbenchmarks]]?
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