On 12/4/21 2:27 AM, Matthew Knepley wrote:

This seems like hyperbole to me. At worst you need one collective operation to figure out who is in. This is no more expensive than one dot product, and probably less. Unless you plan to do this millions of times in the simulation, I do not see the dire problem.

OK, I'll stop worrying and learn to love the bomb :-) - Adrian -- Dr Adrian Croucher Senior Research Fellow Department of Engineering Science University of Auckland, New Zealand email: [email protected] tel: +64 (0)9 923 4611