RE: OpenMosix and Checkpointing

That wouldn't work because the transfer of the state is on demand, ie only
when a page is needed is it actually sent over. So you couldn't use this for
checkpointing. 

Moshe
 

-----Original Message-----
From: openmosix-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
[mailto:openmosix-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org] On Behalf Of Daniel
Marques
Sent: Wednesday, April 05, 2006 7:21 PM
To: Evan Hisey
Cc: openmosix-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
Subject: Re: [Openmosix-devel] OpenMosix and Checkpointing

>   This seems to becoming a often recently, with people assuming that 
> because openMosix does migration it it can do check pointing. Would 
> you mind enlightening me as to why that is.

It seems that, to migrate a process, you must transfer its state (address
space, register file, etc.) from one machine to another.  If you can do
that, it seems you could 'intercept' the transfer, and save/restore that
state to/from a file.  Of course, my understanding of openMosix might be
totally wrong (again, I've only just started to look at it), so please
correct me if I am, ad I want to understand it.

>
>  I would like to clear up one possible error in your impression of 
> openMosix, there is no subset of features for HPC, that is all 
> openMosix is about. If some wants any kind of HAC deployment openMosxi 
> would be counter productive as a single node failure can bring make 
> the whole cluster hiccup, and at the very least toats any jobs that 
> where touching the failed node at time of failure.
>

The work I'm discussing is not HAC (e.g. automatic, transparent, fail-over
of a webserver, etc.) but rather providing fault-tolerance for HPC
applications, i.e., if an application fails 15 hours into a 30 hour run, we
can (maybe after the whole cluster is rebooted) restart the application from
a saved checkpoint file and not have to re-do all the lost work.


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