[mpich-discuss] MPI_Get on the same memory location

[Alessandro Fanfarillo]

Thank you all for the replies,

I have this error with mpich2-1.5 and I have the similar behavior with
a slightly different error message with mpich-3.1.2.

About the code, the situation is a bit more difficult: I wrote a
library which implements the coarray support in gfortran. In other
words, gfortran translates the coarray syntax in library calls, the
library implements the communication using the one-sided routines.
Copying a value on the same buffer is allowed by coarrays (it is not an error).
I have the same Nick's opinion; anyway, if the standard does not tell
anything about this case it is up to the implementation.

I'm going to modify the library in order to manage this case.

Thanks all.

On Thu, Aug 21, 2014 at 4:42 PM, Seo, Sangmin <sseo at anl.gov> wrote:
> Hi Alessandro,
>
> It is very hard to think about the reason for your problem without any code.
> Can you send us your test code and the version of MPICH you are using?
>
> Thanks,
> --
> Sangmin Seo
> Postdoctoral Appointee
> Mathematics and Computer Science Division
> Argonne National Laboratory
> http://www.mcs.anl.gov/~sseo/
>
>
> On Aug 21, 2014, at 5:25 PM, Alessandro Fanfarillo
> <fanfarillo at ing.uniroma2.it> wrote:
>
> Dear all,
>
> I'm having the following error:
>
> Fatal error in MPI_Get: Internal MPI error!, error stack:
> MPI_Get(156).......: MPI_Get(origin_addr=0x19a5f40, origin_count=4,
> MPI_BYTE, target_rank=0, target_disp=0, target_count=4, MPI_BYTE,
> win=0xa0000000) failed
> MPIDI_Get(247).....:
> MPIR_Localcopy(357): memcpy arguments alias each other, dst=0x19a5f40
> src=0x19a5f40 len=4
>
> if I try to execute MPI_Get on the same memory location on a shared
> memory machine (my laptop).
>
> I cannot find anything in the standard that denies it for the one-sided.
>
> Running with OpenMPI everything works fine.
>
> Is it a bug or I missed something in the standard?
>
> Thanks.
>
> Alessandro
>
> --
>
> Alessandro Fanfarillo
> Dip. di Ingegneria Civile ed Ingegneria Informatica
> Università di Roma "Tor Vergata"
> NCAR Office: +1 (303) 497-2442
> Tel: +39-06-7259 7719
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-- 

Alessandro Fanfarillo
Dip. di Ingegneria Civile ed Ingegneria Informatica
Università di Roma "Tor Vergata"
NCAR Office: +1 (303) 497-2442
Tel: +39-06-7259 7719