[Mpi-comments] Fortran naming schemes

[Gregor Corbin]

Dear MPI-Forum,

I have some difficulties to interpret the naming schemes in section 
19.1.5 (MPI 4.0 standard):

Consider two routines (e.g. MPI_Send, MPI_Recv) in the same Fortran 
support method (e.g. 'use mpi_f08'), that both take a choice buffer 
argument. Does the Standard

(a) allow to implement one routine with naming scheme 1A (MPI_Send_f08) 
and the other with scheme 1B (MPI_Recv_f08ts),

(b) demand that 1B (_f08ts) is used either for all routines with choice 
buffer arguments or none,

(c) something else entirely?


My interpretation of this paragraph(p.798, 5-7)

     The mpi and mpi_f08 modules and the mpif.h include file will each 
correspond to
     exactly one implementation scheme from Table 19.1. However, the MPI 
library may contain
     multiple implementation schemes from Table 19.1.

depends whether there are only two distinct naming schemes 1 and 2(each 
with two sub-options A and B) or  four  distinct naming schemes 1A, 1B, 
2A and 2B. The first would imply (a), the second would imply (b).

On the other hand, p.798, line 1-3:

     To set MPI_SUBARRAYS_SUPPORTED to .TRUE. within a Fortran support 
method,
     it is required that all nonblocking and split-collective routines 
with buffer arguments are
     implemented according to 1B and 2B

implies option (a).


Best,

Gregor

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