[mpich-devel] Possible problem with accfence1 test

[Jeff Hammond]

Rajeev pointed out offline that I cannot read. He said it nicely, but that doesn't mean I'm not a bleeping idiot. 

Sorry for my epic fail. I hate stupid people, especially when it's me. 

Jeff

Sent from my iPhone

> On Feb 24, 2015, at 1:32 PM, Nathan Hjelm <hjelmn at lanl.gov> wrote:
> 
> 
> Hey, I am looking that the accfence1 test in MPICH and I think the tests
> is invalid. The test attempts to execute an MPI_Accumulate with different
> datatypes for the origin and destination. The problem is that the test
> violates MPI 3.0 § 11.3.4 p. 426 1-4:
> 
> 
> Each datatype argument must be a predefined datatype or a derived
> datatype, where all basic components are of the same predefined
> datatype. Both datatype arguments must be constructed from the same
> predefined datatype. The operation op applies to elements of that
> predefined type.
> 
> 
> I see no wording in the standard that says this restriction does not
> apply when the operator is MPI_REPLACE. The test is correct if the
> operation is changed from MPI_Accumulate to MPI_Put.
> 
> If the test is correct then it might make sense to make it explicit in
> the standard that the datatype restriction does not apply to MPI_REPLACE.
> 
> -Nathan
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