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The GNU Hurd has a lot of [[advantages]], but there are challenges, too.
Some of these are explained in the [[hurd/critique]].
Even though they're quite popular in the simpler embedded space, there is no
successful true multi-server [[microkernel]] system for general-purpose desktop
use yet. This is still an ongoing research effort. Also the Hurd is not the
only multiserver operating system. Other examples include:
[[Genode OS|https://genode.org/]] (FOSS), [[MINIX 3|https://www.minix3.org/]] (FOSS),
[[HELON OS|http://www.helenos.org/]] (FOSS), and [[QNX|https://blackberry.qnx.com/en]]
Likewise, resource scheduling in distributed operating system kernels is a
research topic. For example, read more about it on the relevant [[Open Issues
page|open_issues/multiprocessing]]. Also, the [[microkernel/Viengoos]]
research kernel project strives to explore these.
TODO: more to come. [[!tag open_issue_documentation]]