:-) Or better yet, not add tagged-collectives and have to "solve" the
complexity they bring by adding persistent operations.
If it's the limit of one two-phased collective that is of concern, this
can be relaxed without using tags (at most N concurrent two-phased
collectives are optimized in some implementations, the others use
point-to-point with a system-generated generation tag per communicator).
--Raja
-=-
Raja Daoud Hewlett-Packard Co.
raja@rsn.hp.com Convex Division