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Date: Thu, 12 Jul 2001 22:47:00 +0200
From: Wilfried Weissmann <Wilfried.Weissmann@gmx.at>
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To: Torrey Hoffman <torrey.hoffman@myrio.com>
CC: "'jesse@cats-chateau.net'" <jesse@cats-chateau.net>,
        Kip Macy <kmacy@netapp.com>, Paul Jakma <paul@clubi.ie>,
        Helge Hafting <helgehaf@idb.hist.no>, "C. Slater" <cslater@wcnet.org>,
        linux-kernel@vger.kernel.org
Subject: Re: Switching Kernels without Rebooting?
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Torrey Hoffman wrote:
> 
> Jesse Pollard wrote:
> 
> [why switching kernels is very hard, and...]
> 
> > Before you even try switching kernels, first implement a process
> > checkpoint/restart. The process must be resumed after a boot
> > using the same
> > kernel, with all I/O resumed. Now get it accepted into the kernel.
> 
> Hear, hear!  That would be a useful feature, maybe not network servers,
> but for pure number crunching apps it would save people having to write
> all the state saving and recovery that is needed now for long term
> computations.

There is a checkpointing and resumeing lib at
ftp://gutemine.geo.uni-koeln.de/pub/chkpt/
I am not sure if it has been ported to linux yet, but it might be worth
a look.

> 
> For bonus points, make it work for clusters to synchronously save and
> restore state for the apps running on all the nodes at once...
> 
> Torrey

bye,
Wilfried
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