[mpich-discuss] bug report: incorrect lower bound from MPI_Type_create_struct

[Rob Latham]

Hi Wei-keng.  I've recorded this as
http://trac.mpich.org/projects/mpich/ticket/2219

==rob

On 01/14/2015 02:47 PM, Wei-keng Liao wrote:
> Attached program is an implementation of example 4.6 from MPI-3 standard.
> It prints the lower bound, upper bound, extent, size, etc. of a datatype
> created
> by MPI_Type_create_struct(). The value of lower bound is incorrect.
>
> Here is the description of example 4.6.
>
> Let type1 have type map, {(double, 0), (char, 8)}, with extent 16.
> Let B = (2, 1, 3), D = (0, 16, 26), and T = (MPI_FLOAT, type1, MPI_CHAR).
> Then a call to MPI_TYPE_CREATE_STRUCT(3, B, D, T, newtype) returns a
> datatype with type map,
> {(float, 0), (float, 4), (double, 16), (char, 24), (char, 26), (char,
> 27), (char, 28)}.
>
> According to the type map of "newtype", its LB should be 0, but the
> result from
> MPICH gives 16. Rajeev believes this is because of the LB of a resized
> type was mistakenly
> carried over to the successive call to MPI_Type_create_struct().

-- 
Rob Latham
Mathematics and Computer Science Division
Argonne National Lab, IL USA
_______________________________________________
discuss mailing list     discuss at mpich.org
To manage subscription options or unsubscribe:
https://lists.mpich.org/mailman/listinfo/discuss