[Trilinos-Users] Deterministic messaging?

[John R Cary]

Hi Jim,


On 6/15/11 8:42 AM, Willenbring, James M wrote:

>
> We have discussed this a few times at developer meetings.  The consensus has been that bit-level reproducibility is prohibitively expensive.  Are you able to modify the test to have some tolerance?  This seems to be the most common way to avoid needing bit-level reproducibility.

Understood.  What we have done in other cases is provide
a bit-level implementation along side a performance oriented,
non-bit-level implementation.

Yes, we can cope.  But FYI, we often find that bit-level
differences indicate memory errors, (typically uninitialized
memory errors) so we try hard to have a mode in which we
can count on bit-level accuracy.

Thx...John