this post was submitted on 26 Jun 2024
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...NeXTstep was built on mach and, although i'm unsure if any antecedents remain in macOS, it was certainly production-ready in its day; i remember a couple of decades ago there were stopgap versions of the HURD built on top of mach instead of their own microkernel but i thought that was only ever intended as a temporary workaround...
...i presume on that basis that sustained developer interest was its greatest hurdle, no pun intended...
edit: ...is this the post-mortem you mentioned?..
I haven't seen that paper before. The ones I remember were blogposts or web pages. In fact, this may be what I was remembering: https://www.gnu.org/software/hurd/faq.html Particularly the part about what happened with the port to different microkernels.
IIRC NeXT and OSX use Mach, but they don't use it as intended. I think they're mostly a BSD kernel with Mach functioning as an interface to userspace.
Hurd actually used Mach as a microkernel, and moved most functionality to userspace daemons. This meant that Mach's performance issues,, at least the ones related to IPC, affected the Hurd a lot more than OSX or NeXT.
And yeah, I think developer interest was the biggest thing that held it back.