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authorThomas Schwinge <thomas@schwinge.name>2010-10-07 00:02:21 +0200
committerThomas Schwinge <thomas@schwinge.name>2010-10-07 00:02:21 +0200
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+[[!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]]."]]"""]]
+
+[[!tag open_issue_hurd]]
+
+We would expect that fine-grained, compartmentalized systems, that is,
+microkernel-based multi-server systems in particular, would be ideal condidates
+for applying multiprocessing. That is, however, only true from a first and
+inexperienced point of view: there are many difficulties.
+
+IRC, #hurd, August / September 2010
+
+ <marcusb> silver_hook: because multi-server systems depend on inter-process
+ communication, and inter-process communication is many times more expensive
+ across cpus
+ <marcusb> silver_hook: so you either force interrelated work on the same cpu,
+ or suffer heavy penalties. and in a typical fine-grained object system, all
+ objects are interconnected!
+ <marcusb> silver_hook: resources in today's systems, even in a single node with
+ one cpu, but more so in a network, are very non-uniform. scheduling these
+ resources efficiently is a huge problem. restricting the resource
+ distribution policies in the way microkernel systems tend to do is posing
+ serious research challenges
+
+---
+
+See also: [[multithreading]].