Re: [Boost-mpi] No arg init

Subject: Re: [Boost-mpi] No arg init
From: Matthias Troyer (troyer_at_[hidden])
Date: 2013-01-28 17:55:29

Hi Alain,

Thank you very much! I'll try to apply it tomorrow. I sometimes prefer the throwing ctor version since my codes often require a certain threading level if they are multi-threaded, but I can add that later.

Matthias

On Jan 28, 2013, at 11:28 AM, Alain O Miniussi <alain.miniussi_at_oca.eu> wrote:

> Oups, forgot to send it to the list.
> 
> =================================
> 
> So, here is next patch, I think it integrates all the discussions except
> for the throwing ctor, which can be added later if a consensus is
> reached.
> 
> I did modify the documentation, but I do not know how to test those
> changes. They are quite simple, but still...
> 
> As for the throwing ctors, my position was that I do not see a strong
> argument in their favor, and would like to see what the user are saying
> (as a user, they would be of no use, I'd like to get 'multiple', but
> will need to deal with the other possibilities anyway, so throwing is
> not a option. But that's just a sample of one).
> 
> Regards
> 
> 
> On Thu, 2013-01-17 at 08:27 -0700, Matthias Troyer wrote:
>> Thank you! I've committed the patch to config.hpp to the trunk and have also updated the documentation.
>> 
>> Matthias
>> 
>> On Jan 16, 2013, at 4:08 PM, Alain O Miniussi <alain.miniussi_at_oca.eu> wrote:
>> 
>>> There is an attached patch with that change.
>>> If it's ok, and once commited, I'll move to the thread init.
>>> 
>>> 
>>> On Mon, 2012-12-31 at 23:05 +0100, Matthias Troyer wrote:
>>>> On Dec 4, 2012, at 10:53 AM, Alain O Miniussi <alain.miniussi_at_oca.eu> wrote:
>>>> 
>>>>> On Thu, 2012-11-29 at 12:55 -0500, Jeremiah Willcock wrote:
>>>>>> On Thu, 29 Nov 2012, Matthias Troyer wrote:
>>>>>> 
>>>>>>> 
>>>>>>> On Nov 29, 2012, at 5:23 PM, Jeremiah Willcock <jewillco_at_[hidden]> wrote:
>>>>>>>> 
>>>>>>>> Another issue with MPI versions is that Boost.MPI currently uses 
>>>>>>>> functions such as MPI_Address that have been removed in MPI 3.0.  Is 
>>>>>>>> that something that should be addressed in the future?  I think the 
>>>>>>>> replacements for some of them did not exist before MPI 2.0.
>>>>>>> 
>>>>>>> A valid point - we will have to provide two implementations depending on 
>>>>>>> which version of MPI is present. Is there any standardized macro that 
>>>>>>> one an check to determine the MPI version at compile time?
>>>>>> 
>>>>>> There are MPI_VERSION and MPI_SUBVERSION, but those are in 2.0 and above 
>>>>>> only as well.  You can probably use their being undefined to mean that the 
>>>>>> implementation does not comply to 2.0.  I don't know how many 1.1-only MPI 
>>>>>> implementations are around anymore, though; there may not be any still in 
>>>>>> use (MPI 2.0 was released in 1997).
>>>>> 
>>>>> That's a good point, especially if the "historical" C++ API was not
>>>>> present in 1.1 (which I think it's the case, it's not clear to me if it
>>>>> was introduced in 1.2 or 2.0). Maybe we should only take into
>>>>> consideration 2.0 and 3.0. 
>>>>> Also, if some 1.1 only API are still use, how many requires a Boost.MPI
>>>>> interface ?
>>>>> 
>>>>> As far as the no arg init is concerned, it seems to me that that
>>>>> - providing them will simplify the API, 
>>>>> - even if some 1.1 only MPI are still around, even if some of them have
>>>>> a use for Boost.MPI, even if those do not support a no arg Init, theirs
>>>>> users still have the possibility to provide those arguments anyway.
>>>>> 
>>>>> Alain
>>>> 
>>>> I checked the implementation and we do have a no arg init for MPI 2.0 or higher since that can be tested by MPI_VERSION. You can also manually define BOOST_MPI_HAS_NOARG_INITIALIZATION to enable it for MPI 1.2 or MPI 1.3 implementations. I assume that this is good enough and we might just want to edit the documentation to make the no arg version the default in the documentation.
>>>> 
>>>> Matthias
>>>> 
>>>> 
>>> 
>>> -- 
>>> Alain Miniussi
>>> Responsable Tech. Centre de Calcul Haute Performance
>>> Obs. de la Côte d'Azur |Mont Gros: [phone]
>>> BP 4229                |Sophia :   [phone]
>>> 06304 Nice Cedex 4     |https://crimson.oca.eu
>>> <mpiinit-r82503.patch>_______________________________________________
>>> Boost-mpi mailing list
>>> Boost-mpi_at_[hidden]
>>> http://lists.boost.org/mailman/listinfo.cgi/boost-mpi
>> 
>> 
> 
> -- 
> Alain Miniussi
> Responsable Tech. Centre de Calcul Haute Performance
> Obs. de la Côte d'Azur |Mont Gros: [phone]
> BP 4229                |Sophia :   [phone]
> 06304 Nice Cedex 4     |https://crimson.oca.eu
> 
> <mtmpi-82588.patch>_______________________________________________
> Boost-mpi mailing list
> Boost-mpi_at_[hidden]
> http://lists.boost.org/mailman/listinfo.cgi/boost-mpi