Connect UMFPACK with Trilinos in deal.II

[Lex Lee]

Hello all,

I am using UMFPACK to directly solve my large system equation Ax=b. The solver process is very slow, as only one core of CPU is involved while running. I am trying to connect UMFPACK with Trilinos, I mean, solve the equation in multithread / parallel mode in deal.II. I know some tutorials in deal.II library talking about parallel computing, however, it looks like not that relevant to my case.

Can someone give me some hints about playing with UMFPACK and Trilinos together in deal.II?

Best,

Lex 

[Wolfgang Bangerth]

You can't. UMFPACK can neither use MPI parallelization, nor does it use
threads to use multiple cores. It is what it is.

But the Trilinos interfaces have a class that uses a parallel direct
solver: TrilinosWrappers::SolverDirect

https://dealii.org/developer/doxygen/deal.II/classTrilinosWrappers_1_1SolverDirect.html
that can help in cases like yours.

Best
W.

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Wolfgang Bangerth email: bang...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/