overlapped. Alas, people use blocking calls in general because they are lazy (50%), they don't know (40%) or they don't care (10%). There is also the chicken and egg problem: nobody really tried to overlap, so MPI implementations didn't bother to support it, so you could not really overlap, so nobody really tried. However, some MPI implementations can overlap today and some applications can leverage it.
all these points are accurate to some degree, but give a sad impression of the typical MPI programmer. how many MPI programmers are professionals, rather than profs or grad students just trying to finish a calculation? I don't know, since I only see the academic side.
for academics, time-to-publish is the main criterion, which doesn't necessarily mean well-designed or tuned code. taking a significant piece of code and experimenting with ways of using async messaging
(or 1-sided, for that matter) is a significant investment of time, with no obvious promise of a payback. yes, one might joke about grad student time being free, the expertise might not also be there. _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
