Answering some of my own questions inline...
Dima Kogan <[email protected]> writes: > 2. Is the MPI implementation significant? Would mpich behave > potentially differently here from openmpi? I rebuilt sundials with mpich instead of openmpi, and those tests now work just fine: nothing locks up. There might be other issues involved here, but I'd like to fully figure out what's going on before proposing any such change. I also poked around with a debugger a little bit: the lockup is inside some MPI calls. Anybody have experience here? I can imagine this is an openmpi bug, but the last time I touched MPI anything was about 20 years ago, so any info from more-recently-experienced people would be welcome.
