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Re: cpu usage and link update in /libexec/runsystem

From: Niels Möller
Subject: Re: cpu usage and link update in /libexec/runsystem
Date: 19 Dec 2001 08:27:07 +0100
User-agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.1

Nuno Morgadinho <gotcha@unsecurity.org> writes:

> > > Iam running the hurd on vmware on top of linux (see screenshot here 
> > > http://alunos.uevora.pt/~l13591/hurd-vmware.png) and I noticed on my 
> > > system monitor that the cpu usage was 100%. Surely this is not normal, is 
> > > it?
> > 
> > cpu usage of vmware in Linux or of something in the Hurd?
> Cpu usage of vmware in Linux. But I also usually run Linux on vmware-Linux 
> and the cpu usage is normal.

Perhaps Mach uses an idle loop when it has nothing to do, while linux
halts the cpu in the same situation? An idle loop is fine when
running on a real machine (except if you care about cooling or power
consumption), but it is unfriendly to emulators and semi-emulators
like vmware. If this guess is correct, booch and plex86 should behave
the same way when running the Hurd.


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