[MPIWG Fortran] Questions about MPI_Comm_spawn
jczhang at mcs.anl.gov
Tue Mar 25 09:51:37 CDT 2014
Hello, Fortran experts,
p.377 of MPI3 defines prototype of MPI_Comm_spawn.
MPI_Comm_spawn(command, argv, maxprocs, info, root, comm, intercomm,
CHARACTER(LEN=*), INTENT(IN) :: command, argv(*)
I can understand that command is a variable-length character. I fetch its
length by len(command). The Fortran compiler needs to pass in data of
command, as well as length of command.
But I can't understand argv(*). I interpret it as an assumed-size array of
variable-length characters. Does that imply each argv(i) could have
different lengths, e.g., len(argv(1)) may be different from len(argv(2))?
I think it is unreasonable, since if that, the compiler has to pass in
length of every element of argv(*).
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