Jack,
“The way to do this is to clone the MPI communicator you use for your
overall
problem once for each linear system. ”
That means for my problem I have to copy the Vector and Matrix of one
linear system（either the thermal diffusion or stokes flow） to another
Vector and Matrix which are built with a clone of present communicator
before starting a thread to solve this linear system.
And then I have to copy the solution of this linear system to the
targeted Vector which is built using the present MPI communicator for
assembling systems.
That seems too complicated. Just set up the linear system (=matrix,
vectors) with a different communicator from the beginning.
By the way is it possible to copy Vector and Matrix of TrilinosWrappers
to another ones those are initialized with another MPI communicator?
I don't remember. It is certainly nor a usual operation. You'll have to
investigate whether copying also copies the communicator or not by
looking at the actual source.
It is not common to solve linear systems on different threads in
parallel when using MPI. I don't want to say that that is not a good
idea -- it seems like a good idea for sure because it can hide some of
the latency associated with MPI communication, but it is not usually
done. I suspect that you will not save much time compared to just
solving the two linear systems one after 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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