I am working with a problem where it takes a long time to assemble the vector u in Ax==u. Running the assemble in parallel does a good job with decreasing the time it takes to assemble, but doing so increases the time it takes to solve the problem. Is it possible for me to assemble u vector in para…

Does the solution from this thread help? [image] Mumps in parallel slower than in serial Hey, I had a similar problem which is due to petsc (or in particular its mumps solver) using thread parallelism via OpenMP. Let us say your PC has n threads available. Then, when y…

That did help with the solver not increasing as much, although it still does increase by a little bit. This is very helpful but I still wonder if there is a way to assemble in parallel and solve in serial?

I have the same problem, only I want to assemble in serial and solve in parallel. I assume that for doing something in parallel you always have to run your script with mpirun, but is there any way to perform some of the commands in your script in serial?

For some commands you can do this, e.g., by using rank = fenics.MPI.comm_world.Get_rank() if rank == 0: % only processor 0 does this % the other commands are executed in parallel However, this will not help with your problem directly. What you can do is to use the multithreading ability of P…

Assembling in Parallel and Solving in Serial

Linear Algebra

kamensky June 6, 2019, 5:42pm 2

Does the solution from this thread help?

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Assembling in Parallel and Solving in Serial

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