MPI_Cart_Coords maxdims/ndims mixup missing from MPI 3.1 to MPI 4.0

[felker]

Problem

In the description of the coords parameter of this function, the MPI 3.1 standard claims that it returns an integer array of size ndims. It should say that the array is of size maxdims.

This is already fixed in the 4.0 standard:

Proposal

Simply add the correction to the 3.1 errata: https://www.mpi-forum.org/docs/mpi-3.1/errata-31.pdf

References and Pull Requests

[wesbland]

I added the relevant chapter committee here.

It looks like this was already fixed for MPI 4.0. Should we consider backdating an errata fix for MPI 3.1 and put it in the errata document as suggested?

@wgropp - Happy to hear from you here as well.

[wgropp]

This is a clear typo - there really isn't any danger of misinterpretation, since there isn't an ndims argument. As such, it does not belong in the errata, which we've restricted to errors that impact interpretation of the standard. Otherwise, the errata would exceed 1000 pages.

[wesbland]

Fair enough. Closing.