[Mpi3-ft] Nonblocking Process Creation and Management

Wed Jan 13 14:47:47 CST 2010

Why would JOIN be any less useful today than in the past? Why would you
want to deprecate it?  It is a trivial bootstrap for the simplest form of
ACCEPT/CONNECT. It just hides the ACCEPT and CONNECT operations and lets
the user handle the complexity of identifying the two end points any way he
likes.

I never felt JOIN was needed very badly but it went in as a "what the heck"
decision and I do not see that anything has changed.

Is it because IJOIN seems more difficult than IACCEPT and ICONNECT in some
way?

When you say CANCEL should be deprecated, do you mean MPI_Cancel of an
outstanding ISEND/IRECV request or something else?

Dick Treumann  -  MPI Team
IBM Systems & Technology Group
Dept X2ZA / MS P963 -- 2455 South Road -- Poughkeepsie, NY 12601
Tele (845) 433-7846         Fax (845) 433-8363

  From:       "Supalov, Alexander" <alexander.supalov at intel.com>                                                                           

  To:         "MPI 3.0 Fault Tolerance and Dynamic Process Control working Group" <mpi3-ft at lists.mpi-forum.org>                            

  Date:       01/13/2010 02:53 PM                                                                                                          

  Subject:    Re: [Mpi3-ft] Nonblocking Process Creation and Management                                                                    

  Sent by:    mpi3-ft-bounces at lists.mpi-forum.org                                                                                          

Thanks. I meant the JOIN per se as a way of establishing the communicator.
Do we need that still? What practically relevant cases can be provided to
justify its continuing existence? If there are none, we should rather
deprecate the JOIN and drop the IJOIN.

Good point on the CANCEL.

-----Original Message-----
From: mpi3-ft-bounces at lists.mpi-forum.org [
mailto:mpi3-ft-bounces at lists.mpi-forum.org] On Behalf Of Josh Hursey
Sent: Wednesday, January 13, 2010 8:25 PM
To: MPI 3.0 Fault Tolerance and Dynamic Process Control working Group
Subject: Re: [Mpi3-ft] Nonblocking Process Creation and Management

Since join() does a handshake to create the new communicator, it
should be delayed by the remote side of the protocol. A nonblocking
version would allow the application to possibly do other computation
while waiting for the remote side.

As far as Cancel, I have been thinking that it might be useful for
Accept and Connect. Though with the normal problems of Cancel, I don't
know how to really specify it. I want to look into it a bit more
before next week to see if anything useful can be said of using Cancel
with Accept/Connect.

-- Josh

On Jan 13, 2010, at 2:01 PM, Supalov, Alexander wrote:

> Hi,
>
> Do we really need the IJOIN thing? I think the JOIN itself should be
> deprecated. Just as CANCEL, by the way.
>
> Best regards.
>
> Alexander
>
> -----Original Message-----
> From: mpi3-ft-bounces at lists.mpi-forum.org [
mailto:mpi3-ft-bounces at lists.mpi-forum.org
> ] On Behalf Of Josh Hursey
> Sent: Tuesday, January 12, 2010 11:04 PM
> To: MPI 3.0 Fault Tolerance and Dynamic Process Control working Group
> Subject: [Mpi3-ft] Nonblocking Process Creation and Management
>
> I extended and cleaned up the Nonblocking Process Creation and
> Management proposal on the wiki:
>    https://svn.mpi-forum.org/trac/mpi-forum-web/wiki/Async-proc-mgmt
>
> I added the rest of the nonblocking interface proposals, and touched
> up some of the language. I do not have an implementation yet, but will
> work on that next. There are a few items that I need to refine a bit
> still (e.g., MPI_Cancel, mixing of blocking and nonblocking), but this
> should give us a foundation to start from.
>
> I would like to talk about this next week during our working group
> slot at the MPI Forum meeting.
>
> Let me know what you think, and if you see any problems.
>
> Thanks,
> Josh
>
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