[mpi3-rma] Plans ?

[Pavan Balaji]

Oh, and I forgot to add that the RMA operations themselves should 
probably be allowed to set a "fence" flag as well, which would be 
equivalent to RMA operation + 0-byte send with special tag set. That is, 
they would be flushed out immediately, but will not require any 
interference from the remote process.

  -- Pavan

On 01/27/2008 07:08 PM, Pavan Balaji wrote:
> Rich, Jarek,
> 
> The ordering should definitely not be enforced in all cases. As I 
> mentioned in the brief description below, the application should be able 
> to inform the MPI stack to flush out previous requests through a 
> "special tag". Consider an example where the sender wants to place some 
> data in the receiver buffers through RMA operations and inform it that 
> the data is written through a regular send operation -- this can be 
> achieved by tagging the last send with the special tag, instead of 
> having the receiver wait for the window to be closed before being able 
> to use the data received through RMA operations. This is similar to 
> fence, but on a process-pair basis, rather than on a window basis.
> 
>  -- Pavan
> 
> On 01/27/2008 06:50 PM, Nieplocha, Jarek wrote:
>> Good point Rich.  
>> Enforcing ordering for all the cases say on networks with adaptive 
>> routing can be expensive and unnecessary.
>>  
>> Jarek
>>
>> ________________________________
>>
>> From: mpi3-rma-bounces at cs.uiuc.edu on behalf of Richard Graham
>> Sent: Sun 1/27/2008 4:44 PM
>> To: MPI 3 Remote Memory Operations
>> Subject: Re: [mpi3-rma] Plans ?
>>
>>
>> Can you elaborate on this ?
>>
>> What is the intent ?
>>
>> Do you want to have ordering be required, or optional ?  Seems like 
>> there are times
>>  where you would like to have ordering guarantees, and others in which 
>> you want the
>>  network to blast things through as fast a possible, w/o concern for 
>> ordering.
>>
>> Rich
>>
>>
>> On 1/27/08 12:26 AM, "Pavan Balaji" <balaji at mcs.anl.gov> wrote:
>>
>>
>>
>>     
>>     
>>     I was planning to write a proposal on ordering and completion of
>>     requests. Specifically, to treat RMA operations as ordered with 
>> respect
>>     to how application writers perceive it. That is, if process A 
>> sends an
>>     RMA message to process B, and then sends a regular message to 
>> process B
>>     (with a special TAG, for instance), the MPI stack on process B should
>>     deliver both the RMA message as well as the regular message to the
>>     application. That is, it should not wait for the remote window to 
>> close
>>     before doing so.
>>     
>>     However, it'll be good to have a telecon to bounce off ideas and get
>>     initial comments before we go off and spend time writing more 
>> detailed
>>     proposals.
>>     
>>     Is a telecon being planned? I don't seem to have received any email
>>     about this.
>>     
>>       -- Pavan
>>     
>>     On 01/26/2008 10:43 PM, Rajeev Thakur wrote:
>>     > It would be good to know if anyone is planning to write a 
>> proposal on any
>>     > topic for MPI-3 RMA.
>>     >
>>     > Rajeev
>>     >
>>     >> -----Original Message-----
>>     >> From: mpi3-rma-bounces at cs.uiuc.edu
>>     >> [mailto:mpi3-rma-bounces at cs.uiuc.edu] On Behalf Of Richard Graham
>>     >> Sent: Wednesday, January 23, 2008 10:18 AM
>>     >> To: mpi3-rma at cs.uiuc.edu
>>     >> Subject: [mpi3-rma] Plans ?
>>     >>
>>     >> What are the plans for this working group ?  At the meeting
>>     >> last week there seemed to be quite a bit of interest in this
>>     >> topic, and it seemed like there could be at least 2 groups
>>     >> working on this.  Seems like, if this is the case, it would
>>     >> be better to try and coordinate early on within the working
>>     >> group, rather than try and rationalize two or more well
>>     >> developed proposals.
>>     >> Any thoughts here ?
>>     >>
>>     >> Rich
>>     >>
>>     >> _______________________________________________
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>>     >> mpi3-rma at cs.uiuc.edu
>>     >> http://lists.cs.uiuc.edu/mailman/listinfo/mpi3-rma
>>     >>
>>     >>
>>     >
>>     > _______________________________________________
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>>     >
>>     
>>     --
>>     Pavan Balaji
>>     http://www.mcs.anl.gov/~balaji
>>     _______________________________________________
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>>     mpi3-rma at cs.uiuc.edu
>>     http://lists.cs.uiuc.edu/mailman/listinfo/mpi3-rma
>>     
>>     
>>
>>
>>
>>
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> 

-- 
Pavan Balaji
http://www.mcs.anl.gov/~balaji