[deal.II] SparseDirectMUMPS before deal.ii 8.3.0

[hkch...@gmail.com]

Hi, everyone.

I have installed the deal.ii version 8.2.1 to use SparseDirectMUMPS replace SparseDirectUMFPACK. It seems that I can run it in parallel like mpirun -np 2 ./MyProgram, but standard IO std::cout is used in my code, what should I do to print log in terminal only once?

Best,

Chen

[Praveen C]

You need this

https://dealii.org/current/doxygen/deal.II/classConditionalOStream.html

[陈敏]

Thanks, Praveen.

I think the SparseDIrectMUMPS in dealii-8.2.1 don't need run program with mpirun -np N ./Program just ./Program and MUMPS will run parallel controlling by itself. can I control it by myself?

Best,

Chen

Praveen C <pra...@gmx.net> 于2022年4月21日周四 16:14写道：

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[Wolfgang Bangerth]

On 4/21/22 21:32, 陈敏 wrote:
>
> I think the SparseDIrectMUMPS in dealii-8.2.1 don't need run program with

> mpirun -np N ./Program just ./Programand MUMPS will run parallel controlling

> by itself. can I control it by myself?

If you call a program without mpirun, it will not know that there is a
universe of parallel execution out there. It can only run with multiple
threads in a shared memory space on a single machine. It will definitely not
be able to use other machines.

Best
W.

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