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Subject: Re: [OMPI users] MPI based HLA/RTI ?
From: John Chludzinski (john.chludzinski_at_[hidden])
Date: 2013-04-15 11:37:33


Is that "in the works"?

On Mon, Apr 15, 2013 at 11:33 AM, Ralph Castain <rhc_at_[hidden]> wrote:

>
> On Apr 15, 2013, at 8:29 AM, John Chludzinski <john.chludzinski_at_[hidden]>
> wrote:
>
> That would seem to preclude its use for an RTI. Unless you have a card up
> your sleeve?
>
>
> One can relax those requirements while maintaining the ability to use
> send/recv - you just can't use MPI collectives, and so the result doesn't
> conform to the MPI standard....yet still retains value for those wanting to
> utilize high-speed, low-latency interconnects in non-MPI situations.
>
>
>
> ---John
>
>
> On Mon, Apr 15, 2013 at 11:23 AM, Ralph Castain <rhc_at_[hidden]> wrote:
>
>> It isn't the fact that there are multiple programs being used - we
>> support that just fine. The problem with HLA/RTI is that it allows programs
>> to come/go at will - i.e., not every program has to start at the same time,
>> nor complete at the same time. MPI requires that all programs be executing
>> at the beginning, and that all call finalize prior to anyone exiting.
>>
>>
>> On Apr 15, 2013, at 8:14 AM, John Chludzinski <john.chludzinski_at_[hidden]>
>> wrote:
>>
>> I just received an e-mail notifying me that MPI-2 supports MPMD. This
>> would seen to be just what the doctor ordered?
>>
>> ---John
>>
>>
>> On Mon, Apr 15, 2013 at 11:10 AM, Ralph Castain <rhc_at_[hidden]> wrote:
>>
>>> FWIW: some of us are working on a variant of MPI that would indeed
>>> support what you describe - it would support send/recv (i.e., MPI-1), but
>>> not collectives, and so would allow communication between arbitrary
>>> programs.
>>>
>>> Not specifically targeting HLA/RTI, though I suppose a wrapper that
>>> conformed to that standard could be created.
>>>
>>> On Apr 15, 2013, at 7:50 AM, John Chludzinski <
>>> john.chludzinski_at_[hidden]> wrote:
>>>
>>> > This would be a departure from the SPMD paradigm that seems central to
>>> > MPI's design. Each process would be a completely different program
>>> > (piece of code) and I'm not sure how well that would working using
>>> > MPI?
>>> >
>>> > BTW, MPI is commonly used in the parallel discrete even world for
>>> > communication between LPs (federates in HLA). But these LPs are
>>> > usually the same program.
>>> >
>>> > ---John
>>> >
>>> > On Mon, Apr 15, 2013 at 10:22 AM, John Chludzinski
>>> > <john.chludzinski_at_[hidden]> wrote:
>>> >> Is anyone aware of an MPI based HLA/RTI (DoD High Level Architecture
>>> >> (HLA) / Runtime Infrastructure)?
>>> >>
>>> >> ---John
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>>>
>>>
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