Nathan,
i am experiencing some issues and i found commit
0bf06de3f1444f469303e47752430ec9b423b33f
https://github.com/open-mpi/ompi/commit/0bf06de3f1444f469303e47752430ec9b423b33f
and the following are very likely the root cause.
i experience this on a linux sparc system only.
Per the commit log :
"[...] This takes advantage of the fact that on most (all?)
systems the top bit of a user-space pointer is never set. If this
changes then a new sentinel will be needed."
i am sorry to report the assumption is wrong :-(
print group->grp_proc_pointers[0]
Result = (struct ompi_proc_t *) 0xfffff8010010f540
what about using the lower bit instead ?
my assumption is that ompi_proc_t objects are aligned (static or
malloc'ed one) on at least a pointer size (4 in x86) so the lower bit
should always be zero.
any thoughts ?
Cheers,
Gilles
