[Mpi3-hybridpm] Fw: [MPI Forum] #208: MPI3 Hybrid Programming: multiple endpoints per collective, option 1

[Pavan Balaji]

It might be OK to just add the mailing list on the CC. Maybe someone
will need to add the appropriate TRAC email to the sender filters, but
that should work.

 -- Pavan

On 01/05/2010 02:58 PM, Douglas Miller wrote:
> Not sure how to change the "recipients" of these tickets, but here is the
> first one for one possible solution. I just put down the basic idea, and
> thought we'd add problems, comments, alterations, etc, as we go.
> 
> thanks,
> 
> _______________________________________________
> Douglas Miller                  BlueGene Messaging Development
> IBM Corp., Rochester, MN USA                     Bldg 030-2 A410
> dougmill at us.ibm.com               Douglas Miller/Rochester/IBM
> ----- Forwarded by Douglas Miller/Rochester/IBM on 01/05/2010 02:56 PM
> -----
>                                                                            
>              "MPI Forum"                                                   
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>                                        undisclosed-recipients:;            
>              01/05/2010 02:53                                           cc 
>              PM                                                            
>                                                                    Subject 
>                                        [MPI Forum] #208: MPI3 Hybrid       
>                                        Programming: multiple endpoints per 
>                                        collective, option 1                
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> 
> #208: MPI3 Hybrid Programming: multiple endpoints per collective, option 1
> ----------------------------------------------------------+-----------------
> 
>                     Reporter:  dougmill@…                 |
> Owner:  dougmill@…
>                         Type:  Enhancements to standard   |
> Status:  new
>                     Priority:  Not ready / author rework  |
> Milestone:  2010/01/19 Atlanta, USA
>                      Version:  MPI 3.0                    |
> Keywords:
>               Implementation:  Unnecessary                |
> Author_bill_gropp:  0
>           Author_rich_graham:  0                          |
> Author_adam_moody:  0
>       Author_torsten_hoefler:  0                          |
> Author_dick_treumann:  0
> Author_jesper_larsson_traeff:  0                          |
> Author_george_bosilca:  0
>            Author_david_solt:  0                          |
> Author_bronis_de_supinski:  0
>         Author_rajeev_thakur:  0                          |
> Author_jeff_squyres:  0
>     Author_alexander_supalov:  0                          |
> Author_rolf_rabenseifner:  0
> ----------------------------------------------------------+-----------------
> 
>  Endpoints (agents) must join "the active group" before doing any
>  communication, or when they are idle and lending themselves to use by
>  other endpoints. The act of joining is non-blocking and lightweight. At
>  the end of a "communication phase" the endpoint/agent will leave "the
>  active group". The act of leaving is a blocking, collective, call: it
>  blocks until all active endpoints have called "leave" and all active
>  communications work has completed (on that endpoint). If more endpoints
>  join the active group while some are leaving, the ones already leaving
>  wait for all newly joined endpoints to also leave. In order to avoid early
>  joiners from leaving immediately, the program may need to do some sort of
>  barrier after the join. Steps for each agent that is participating in
>  communications phase:
>  {{{
>  MPI_Endpoint_join();
>  local_barrier();
>  [optionally do communications]
>  MPI_Endpoint_leave();
>  }}}
>  "Helper" threads/agents do not do any communications, they simply join,
>  barrier, and leave.
> 
> --
> Ticket URL: <https://svn.mpi-forum.org/trac/mpi-forum-web/ticket/208>
> MPI Forum <https://svn.mpi-forum.org/>
> MPI Forum
> 
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-- 
Pavan Balaji
http://www.mcs.anl.gov/~balaji