[MPIWG Fortran] Type of MPI_Status
longb at cray.com
Tue Mar 18 10:07:28 CDT 2014
On Mar 18, 2014, at 9:10 AM, Rolf Rabenseifner <rabenseifner at hlrs.de> wrote:
> based on Bill's explanations
> I understand that all is the same:
> KIND(0) = KIND(1) = KIND(237834)
> = KIND(any default INTEGER number)
> = KIND(any default INTEGER variable) = KIND(ICVDhjk)
> = KIND(INTEger)
> provided that there is no "IMPLICIT NONE"and therefore,
> the with I beginning variables ICVDhjk and INTEger
> are automatically of type default INTEGER
Or if you explicitly declare the argument to be a default integer, which is safer in case you accidentally choose a variable also used by the surrounding code.
> Remark: You should never use KIND(INTEGER) because it may
Reasonable rule of thumb for various reasons. But this also excludes KIND(INTEger) since variable names in Fortran are case-insensitive.
> cause a name conflict if the MPI applications declares an
> own variable with name INTEGER.
> Best regards
> ----- Original Message -----
>> From: "Jeff Squyres (jsquyres)" <jsquyres at cisco.com>
>> To: "MPI-WG Fortran working group" <mpiwg-fortran at lists.mpi-forum.org>
>> Sent: Tuesday, March 18, 2014 2:23:24 PM
>> Subject: Re: [MPIWG Fortran] Type of MPI_Status
>> On Mar 17, 2014, at 6:09 PM, Bill Long <longb at cray.com> wrote:
>>>> Crap, again? I keep forgetting which language I'm programming in.
>>>> I checked this with gfortran and it worked (as it should, but
>>>> not in the way I thought it would). That is why I originally
>>>> suggested to Jeff it be
>>>> (because the literal 1 is an integer), but he asked what the heck
>>>> does that mean so I came up with an example that I thought was
>>>> more clear (but was actually worse).
>>> More important, 1 is of type *default* integer, which is the
>>> requirement here.
>> So -- I'm now confused. Should I use KIND(0) or KIND(1)? Both have
>> been cited in this email thread.
>> Jeff Squyres
>> jsquyres at cisco.com
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> Dr. Rolf Rabenseifner . . . . . . . . . .. email rabenseifner at hlrs.de
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Bill Long longb at cray.com
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