[[!meta copyright="Copyright © 2010 Free Software Foundation, Inc."]] [[!meta license="""[[!toggle id="license" text="GFDL 1.2+"]][[!toggleable id="license" text="Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled [[GNU Free Documentation License|/fdl]]."]]"""]] 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]] (proprietary). 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]]