On Tue, Aug 6, 2019 at 9:54 AM Emmanuel Thomé via users <
users@lists.open-mpi.org> wrote:
> Hi,
>
> In the attached program, the MPI_Allgather() call fails to communicate
> all data (the amount it communicates wraps around at 4G...). I'm running
> on an omnipath cluster (2018 hardware), openmpi
The snippets suggest you were storing a reference to an object on the
stack. Stack variables go out of scope when the function returns. Using a
reference to them out-of-scope is illegal but often fails
nondeterministically. Good compilers will issue a warning about this under
the right conditions (
