MPI implementation of OpenFOAM

Jamshidi · October 27, 2010, 07:47

I need some information about MPI implementation of openFOAM. I can run openFOAM in parallel but I want to know how does it work.

Any help is appreciated.

aut_iut · October 27, 2010, 08:06

Have you seen available tutorials yet?
Take a look at the wingMotion tutorial in pimpleDyMFoam directory.
regards,
Rasoul

nimasam · October 27, 2010, 09:27

look at user guide page 65 & page 84
of course it shows only how to use decompose utility in openFoam not details, if u want to have more knowledge in general about parallel processing not what modified in openFoam, you can search for key words MPI , openMP or domain decomposition

Jamshidi · October 30, 2010, 15:22

Thanks.

I could find some clues in "Pstream.C" by searching MPI functions in "src" folder. I have also understand that "argList" which process argument will call "init" method of "Pstream" Class. But I don't know at the end how information are gather together to reach the final answer. I should explore code more.

olesen · October 31, 2010, 11:33

Quote:

Originally Posted by Jamshidi

Thanks.

I could find some clues in "Pstream.C" by searching MPI functions in "src" folder. I have also understand that "argList" which process argument will call "init" method of "Pstream" Class. But I don't know at the end how information are gather together to reach the final answer. I should explore code more.

You should look for OpenFOAM source that uses 'scatter'/'gather' and 'reduce'. This should help you get started the most (I think).

Jamshidi · November 5, 2010, 15:39

I have understand how OpenFOAM is parallelized with mpi completely. If some one else knows this implementation, let me know if he thinks I can parallelize it with openmp in the same way.

chegdan · June 23, 2011, 22:56

Quote:

Originally Posted by Jamshidi

I have understand how OpenFOAM is parallelized with mpi completely. If some one else knows this implementation, let me know if he thinks I can parallelize it with openmp in the same way.

Jamshidi,

Where did you start? I'm curious as to how OF does this as well. Especially how OF solves the decomposed domains in parallel and passes info back and forth. Have you written this in a thesis or on the wiki somewhere? Let me know.

Dan

bongbongxanh · June 25, 2011, 10:19

Quote:

Originally Posted by Jamshidi

I have understand how OpenFOAM is parallelized with mpi completely. If some one else knows this implementation, let me know if he thinks I can parallelize it with openmp in the same way.

Wow... an awesome work you've done !!! it's very very kind of you if you can share it with us.

October 27, 2010, 07:47	MPI implementation of OpenFOAM	#1
Jamshidi New Member Z Jamshidi Join Date: Oct 2010 Posts: 3 Rep Power: 16	I need some information about MPI implementation of openFOAM. I can run openFOAM in parallel but I want to know how does it work. Any help is appreciated.

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October 27, 2010, 08:06		#2
aut_iut Member Rasoul Join Date: Feb 2010 Posts: 32 Rep Power: 16	Have you seen available tutorials yet? Take a look at the wingMotion tutorial in pimpleDyMFoam directory. regards, Rasoul

October 27, 2010, 09:27		#3
nimasam Senior Member Nima Samkhaniani Join Date: Sep 2009 Location: Tehran, Iran Posts: 1,267 Blog Entries: 1 Rep Power: 25	look at user guide page 65 & page 84 of course it shows only how to use decompose utility in openFoam not details, if u want to have more knowledge in general about parallel processing not what modified in openFoam, you can search for key words MPI , openMP or domain decomposition

October 30, 2010, 15:22		#4
Jamshidi New Member Z Jamshidi Join Date: Oct 2010 Posts: 3 Rep Power: 16	Thanks. I could find some clues in "Pstream.C" by searching MPI functions in "src" folder. I have also understand that "argList" which process argument will call "init" method of "Pstream" Class. But I don't know at the end how information are gather together to reach the final answer. I should explore code more.

November 5, 2010, 15:39		#6
Jamshidi New Member Z Jamshidi Join Date: Oct 2010 Posts: 3 Rep Power: 16	I have understand how OpenFOAM is parallelized with mpi completely. If some one else knows this implementation, let me know if he thinks I can parallelize it with openmp in the same way.