[MPICH] Bug in rings test of the MPI Intel Test suite ?

[William Gropp]

Thanks for the note.  This is fixed in our most current version; do  
you have the latest version of the Intel suite (there have been many  
minor but important fixes like this, particular for bugs that show up  
on 64 bit platforms)?

Bill

On Oct 4, 2007, at 10:46 AM, Sylvain Jeaugey wrote:

> Hi all,
>
> I think I just found a bug in the "rings" test of the Intel Test  
> Suite. I didn't find a dedicated mailing list, so I'm posting here.
>
> At line 231 of node.c, we call :
>    ierr = MPI_Bcast(&seed, 1, MPI_LONG, 0, MPI_COMM_WORLD);
>
> However, seed is an "int". On itanium, sizeof(long) is 8 whereas  
> sizeof(int) is 4. This causes the Bcast of seed as well as .... the  
> lower 4 bytes of the rings pointer. In my case, process 0 and  
> process 1 don't have the same pointer for rings, hence causing  
> quickly a segmentation fault.
>
> I changed the type to MPI_INTEGER :
>    ierr = MPI_Bcast(&seed, 1, MPI_INTEGER, 0, MPI_COMM_WORLD);
> and everything works fine.
>
> Sylvain
>
>
>