On Oct 28, 2012, at 10:28 AM, Dmitri Gribenko wrote:
> Thank you for the feedback! Hopefully the attached patch fixes both of these.
>
> 1. There are two helper structs with complex numbers. I predicated
> the struct declarations and use to appear only in C99.
>
> 2. These macros were indeed missing.
I did a few tests and this now looks good; no more warnings.
I brought up this functionality on the weekly OMPI dev telecon today and got an
important piece of feedback: apparently there are a large class of apps that
wrap their messages as transparent blobs, and then use either non-blob-like or
derived MPI datatypes. (I said something similar to this earlier in the
thread, but I didn't know that there was a large class of apps that actually
did it)
A very simple example is:
char *foo = malloc(...);
// ...fill foo...
MPI_Send(foo, x, MPI_INT, ...);
Another not-uncommon example is:
char *foo = malloc(...);
// Receive some INTEGERs from a Fortran sender
MPI_Recv(foo, x, MPI_INTEGER, ...);
With this patch, they'd get warnings about these uses, even though they are
completely valid according to MPI.
A suggestion was that this functionality could be disabled by default, and
enabled with a magic macro. Perhaps something like:
mpicc -DOMPI_DDT_CHECKING ...
or something like that.
Thoughts?
--
Jeff Squyres
jsquy...@cisco.com
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