Re: another laundry or shopping list

[Alan Robertson <alanr@unix.sh>]

Bruce Walker wrote:
> 
> > Alan Robertson wrote
> >
> > And if it is a process with a 10 megabyte address space, (in general)
> > it's
> > state is the contents of that 10 megabyte address space plus kernel
> > stack,
> > etc. ;-)
> 
> At Intel some years ago,  one aspect of the design of the 486 chip was
> done on an SSI cluster of 370's (running a Unix variant) and at one
> point they migrated a 256meg process from one nod

Migrating a process is fine.  The context of this note was talking about
continually checkpointing such a process *at every heartbeat*.  This is very
expensive.  Without some kind of hardware support it's probably
impossible...

I worked for Bell Labs for 21 years, and saw various kinds of HA support in
various products.

I've seen people do this kind of thing with good hardware support and it
(continuous availability checkpointing) is *still* very expensive.

	-- Alan Robertson
	   alanr@unix.sh

Linux-cluster: generic cluster infrastructure for Linux
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