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We don't have any broadly used non-fork samples. Windows, macOS, and Linux all have fork. So the presence of fork can't be the reason for the performance differ
by nvme0n1p1 5mo ago
We don't have any broadly used non-fork samples. Windows, macOS, and Linux all have fork. So the presence of fork can't be the reason for the performance difference.
(Windows's fork is called ZwCreateProcess)
- dcrazy 5mo agoNtCreateProcess does not implement a forking model. It is analogous to posix_spawn.
- nvme0n1p1 5mo agoIf you pass null for the section handle, it shares pages with the calling process, thus implementing a forking model. Or at least the parts of a forking model that some people erroneously believe are responsible for performance differences.
- Someone 5mo agoMacOS has posix_spawn. See https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/posix_spawn.2.html https://developer.apple.com/library/archive/documentation/Sy... (yes, that’s an iOS man page. MacOS has the call, too, but I couldn’t find the man page online and it looks identical to me) I don’t know how they implemented it, though. Under the hood, it could do the equivalent of a fork/exec pair.
- plorkyeran 5mo agoXNU's posix_spawn implementation is not fork/exec-based. It does roughly what the API suggests it would do.
- dcrazy 5mo agoXNU is open source; here’s a link into the middle of the implementation, after it’s copied all the necessary attributes of the parent into the new process structure: https://github.com/apple-oss-distributions/xnu/blob/f6217f891ac0bb64f3d375211650a4c1ff8ca1ea/bsd/kern/kern_exec.c#L4039 https://github.com/apple-oss-distributions/xnu/blob/f6217f89...