[mpich-discuss] Warning message during "make"

["Antonio J. Peña"]

Hi Raymond,

That is just a performance warning, but has absolutely no correctness 
implications. That comes from the tradeoff of performance vs. space. 
Sometimes we choose to pack a structure in spite of memory usage rather 
than optimizing access time to all of its fields, as we may consider 
that being of more interest.

I hope this answers your question.

Best,
   Antonio


On 02/25/2014 04:48 AM, Raymond D Wright wrote:
> Hello,
>
> If I could ask a beginners question - I get this warning in "m.txt" at
> the end of doing "make":
>
> sed -e 's/^C/\!/g' -e '/EXTERNAL/d' \
> 		-e '/REAL\*8/d' \
> 		-e '/DOUBLE PRECISION/d' \
> 		-e '/MPI_WTICK/d' src/binding/f77/mpif.h > src/binding/f90/mpifnoext.h
>    MOD      src/binding/f90/mpi_constants.mod-stamp
> src/binding/f90/mpi_constants.f90(7): warning #6379: The structure
> contains one or more misaligned fields.   [MPI_STATUS]
>          TYPE :: MPI_Status
> ----------------^
>
> Is it likely to cause trouble when I start using mpich?
>
> (I need it for "hdf5","netcdf","io/api" as infrastructure to
> "models-3/cmaq")
>
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-- 
Antonio J. Peña
Postdoctoral Appointee
Mathematics and Computer Science Division
Argonne National Laboratory
9700 South Cass Avenue, Bldg. 240, Of. 3148
Argonne, IL 60439-4847
apenya at mcs.anl.gov
www.mcs.anl.gov/~apenya