Jack,
unrelated to the question about versions of MPI libraries, when you solve two
linear systems on separate threads, you need to pay attention that the two
solvers (and all associated objects such as matrices, vectors, etc) use
separate MPI communicators. Otherwise you will have the two solvers send
messages on the same communicator at the same time, and this is certain to
lead to trouble.
The way to do this is to clone the MPI communicator you use for your overall
problem once for each linear system. This way, each linear system uses its own
communication channel, and one solver can not get in the way of the other.
Best
W.
--
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Wolfgang Bangerth email: bange...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/
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