Quiecence is certainly a interesting topic, I wasn't able to finish my comments towards the end of the discussion yesterday. One philosophy of a middleware quiecence is to act as a mechanism to tell the middleware to prepare for a recovery, fail if it cannot prepare, and wait until it is told to resume. In the context of a one-sided library by the name ARMCI, a long time ago, I implemented some of the semantics for such a quiecence.  
 
What we were trying to accomplish in general there required a un-coordinated global quiecence. What we were discussing yesterday is certainly more general.
 
Yet, a paper discussing the work is at http://domino.research.ibm.com/comm/research_people.nsf/pages/scarpazza.pubs.html/$FILE/2007-09-17-cluster.pdf
 
Thanks,
Vinod Tipparaju.

> From: jjhursey@open-mpi.org
> Date: Wed, 28 Jan 2009 12:13:44 -0500
> To: mpi3-ft@lists.mpi-forum.org
> Subject: Re: [Mpi3-ft] Quiescence Interface
>
> Starting discussion on this proposal at the next forum meeting sounds
> fine to me. I don't know if we need to devote the whole time to this
> proposal, but I can prepare a few things for our discussion. I hope
> to have a basic prototype ready by then too.
>
> I can contact Paul Hargrove (BLCR) to see if he would be interested
> in attending this discussion. Since this proposal is a collective
> operation, it might be useful to have someone from the collective
> working group sit in to make sure the proposal is phrased appropriately.
>
> Cheers,
> Josh
>
> On Jan 28, 2009, at 10:22 AM, Richard Graham wrote:
>
> > Josh,
> > Thanks for sending this around.
> > I would like to schedule a time to start discussion this
> > proposal. To do
> > so, I think we need to have the impacted parties at the table.
> > Since the
> > Evergrid (sp) folks and the BLCR folks are in the Bay area, would
> > it make
> > sense to devote our working group time at the Forum to this
> > subject, and
> > invite then to attend ? Who else would we want to have participate
> > in this
> > discussion ?
> >
> > Thanks,
> > Rich
> >
> >
> > On 1/22/09 10:21 AM, "Josh Hursey" <jjhursey@open-mpi.org> wrote:
> >
> >> I have updated the Quiescence Interface proposal on the wiki:
> >> https://svn.mpi-forum.org/trac/mpi-forum-web/wiki/Quiescence
> >>
> >> I am interested in questions and comments from the group regarding
> >> the
> >> interface, and use-cases. The primary use-case is for application
> >> initiated checkpoint/restart, but the semantics of the proposed API
> >> likely also open doors to other use-cases.
> >>
> >> Let me know what you think.
> >>
> >> Cheers,
> >> Josh
> >>
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