[mpiwg-ft] FTWG Con Call 2013-09-03

Wesley Bland wbland at mcs.anl.gov
Tue Sep 3 14:40:15 CDT 2013

Due to lack of participate (just Manju & I), we cancelled this week's call.
We didn't have anything major to discuss today as we have the forum meeting
next week and things have mostly been prepped for that meeting. I
distributed the most recent version of the slides this morning. I don't
think there are any more changes to be made there other than deciding about
the failure_ack/get_acked vs. get_failed semantic. Once we make a decision,
we need to remove one slide or the other. Which brings me to the other
point I was going to discuss today:

Aurelien provided an example use case for the MPI_COMM_GET_FAILED semantic
just before the call last week. Since we didn't have much time with it, we
decided to wait and discuss it this week. I've been looking at it and the
idea seems solid to me. It's possible that there might be a semantic issue
or two, but the rationale seems good. I propose that we combine
MPI_COMM_FAILURE_ACK/GET_ACKED to create a new function
MPI_COMM_GET_FAILED. Essentially the new function will do exactly the same
thing as the previous functions, just without the separated semantics. The
function header would look like this:

int MPI_Comm_get_failed(MPI_Comm comm, MPI_Group *failed_group);

Where ''failed_group'' is the group of processes which is locally known to
have failed in ''comm''. Obviously there will need to be some textual
changes in the chapter to reflect this change. For the slides, essentially,
we just need to take out slide 7 and remove "[Alternative]" from the title
of slide 8. I won't bother sending out another version of the slides for
this. Rich, can you make these changes in your version?

Other than that, we can talk about future plans on the next call. My
participation over the next month or two might be intermittent. My wife and
I are expecting our first baby in the next 2-3 weeks so I might miss a
couple of calls.


On Tue, Sep 3, 2013 at 8:58 AM, Wesley Bland <wbland at mcs.anl.gov> wrote:

> Dear WG members,
> This is a reminder that according to our planning, we are having our
> regular phone meeting today at 3pm EDT.
> *NOTE THE NEW CALL-IN NUMBER.* This a permanent change from the old
> number.
> Date: September 3,
> Time: 3pm EDT/New York
> Dial-in information: 712-432-0360 <218-339-4600>
> Code: 623998#
> Agenda:
> * Discuss Aurelien's example for MPI_COMM_GET_FAILED
> * Plan for Madrid meeting (quick skim of slides, including changes which
> happened after last call)
> * Discuss plan for proposal moving toward December reading
> Next Meetings:
> * September 17, 2013
> * October 1, 2013
> * October 15, 2013
> * October 29, 2013
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