[MPIWG Fortran] ticket 351

[Bill Long]

Hi Jeff,

I admit that the Fortran standard is (intentionally) vague about what 
constitutes a "command line".  However, I tried the 5 compilers I have 
available (Cray, Intel, PGI, gfortran, Pathscale) with a simple program 
that prints argument 0 == the "command name by which the program was 
invoked", and in all cases the launcher text  (aprun -n1 ) was ignored 
and the program printed "./a.out".    Not conclusive, but suggests that 
the vendors have figured out what the right "quality of implementation" 
action is here.  If there are examples to the contrary, I'd be 
interested in knowing about them.

Cheers,
Bill


On 10/22/13 10:12 AM, N.M. Maclaren wrote:
> On Oct 22 2013, Bill Long wrote:
>>
>> 2) I don't really see the point of this at all.  The user can just
>> call the native Fortran intrinsics directly.  Why should there be a
>> duplicate version that starts with MPI_ ?  I would suggest, instead,
>> that you just add a note in the spec (advice to users) point out that
>> Fortran programmers can access the command line arguments using the
>> language intrinsics.   Maybe someone can convince me this is not
>> adequate, but I've been using those intrinsics with parallel programs
>> for some time and they work just fine.
>
> I assume that the desire for this is to support the systems which do not
> use a mpiexec/mpirun command, but fire up MPI directly, as IBM poe does.
>
> However, I have always felt that the original C approach was a horrible
> hack, just as having C's argument list (and arguments) writable is.
> There were good reasons at the time but, given that Fortran has done
> without it with little to no trouble for so long, I agree with Bill.
>
>
> Regards,
> Nick Maclaren.
>
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-- 
Bill Long                                           longb at cray.com
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