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Subject: Re: [OMPI devel] ompi-trunk: have MPI_REAL2 (if available) but missing MPI_COMPLEX4
From: Lisandro Dalcin (dalcinl_at_[hidden])
Date: 2009-09-26 14:52:21


On Sat, Sep 26, 2009 at 2:07 PM, George Bosilca <bosilca_at_[hidden]> wrote:
> These two issues are completely orthogonal.
>
> On one side, MPI_LOGICALx is not defined by the MPI standard but it is
> supported by several others MPI libraries and as it match a C type it is
> easy to implement.
>

OK, so we agree here.. It is good to have the MPI_LOGICALx despite not
being listed in the standard.

> On the other side, MPI_COMPLEX4 is defined by the MPI standard as an
> optional datatype (MPI 2.2 page 451) which doesn't make it mandatory (sic!),
> is supported by few others MPI libraries but as it doesn't match any C type
> it is really difficult to implement.
>

OK, you are right, it is really difficult to implement, at least in
pure-C code... BTW, this also applies to MPI_REAL2, right ? Then...

$ nm /usr/local/openmpi/dev-trunk/lib/libmpi.so | grep real2
000fe0e0 D ompi_mpi_real2

So if you have support for real(kind=2) in "ompi_mpi_real2" ... Do you
still think that it is so hard to support complex(kind=4) ??

Anyway, I see that MPI_REAL2 is never #define'd to &ompi_mpi_real2 .

>  george.
>
> On Sep 26, 2009, at 11:04 , Lisandro Dalcin wrote:
>
>> Jeff, about ticket #2032 ...
>>
>> I was not asking you to eliminate MPI_LOGICALx, just asked for
>> MPI_COMPLEX4 to be added...
>>
>> If you still think the MPI_LOGICALx should be removed from Open MPI,
>> what about rename the macros to OMPI_LOGICALx ? IMHO, the MPI_LOGICALx
>> (provided that Fortran compilers do support them) are an omission in
>> the 2.2 standard.
>>
>>
>> On Wed, Sep 23, 2009 at 4:33 PM, Lisandro Dalcin <dalcinl_at_[hidden]>
>> wrote:
>>>
>>> Disclaimer: I have almost no experience with Fortran, nor I'm needing
>>> this, but anyway (perhaps just as a reminder for you) :-)...
>>>
>>> Provided that:
>>>
>>> 1) Open MPI exposes MPI_LOGICAL{1|2|4|8}, and they are not (AFAIK)
>>> listed in the MPI standard (I cannot found them in MPI-2.2)
>>>
>>> 2) The MPI-2.2 standard DO list MPI COMPLEX4 (at least in 2.2) ...
>>>
>>> would it make sense that you add MPI_COMPLEX4 support ASAP, even
>>> before full MPI-2.2 support?
>>>
>>> --
>>> Lisandro Dalcín
>>> ---------------
>>> Centro Internacional de Métodos Computacionales en Ingeniería (CIMEC)
>>> Instituto de Desarrollo Tecnológico para la Industria Química (INTEC)
>>> Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)
>>> PTLC - Güemes 3450, (3000) Santa Fe, Argentina
>>> Tel/Fax: +54-(0)342-451.1594
>>>
>>
>>
>>
>> --
>> Lisandro Dalcín
>> ---------------
>> Centro Internacional de Métodos Computacionales en Ingeniería (CIMEC)
>> Instituto de Desarrollo Tecnológico para la Industria Química (INTEC)
>> Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)
>> PTLC - Güemes 3450, (3000) Santa Fe, Argentina
>> Tel/Fax: +54-(0)342-451.1594
>>
>> _______________________________________________
>> devel mailing list
>> devel_at_[hidden]
>> http://www.open-mpi.org/mailman/listinfo.cgi/devel
>
>
> _______________________________________________
> devel mailing list
> devel_at_[hidden]
> http://www.open-mpi.org/mailman/listinfo.cgi/devel
>

-- 
Lisandro Dalcín
---------------
Centro Internacional de Métodos Computacionales en Ingeniería (CIMEC)
Instituto de Desarrollo Tecnológico para la Industria Química (INTEC)
Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)
PTLC - Güemes 3450, (3000) Santa Fe, Argentina
Tel/Fax: +54-(0)342-451.1594