Difference of Microsoft MPI and "parallel_computation.py" code

Shbz · December 18, 2020, 15:28

Hello

I am planning to conduct parallel simulations with SU2.

As explained in SU2 website, I downloaded the Microsoft MPI and used the command "mpiexec -n NP SU2_CFD name.cfg" for parallel computation. It used the "parMETIS" substructure in order to divide domain into groups for parallel computations. Then it worked well and conducted a simulation faster than sequential one.

However, there is another python code in SU2 called "parallel_computation.py".
What is this code for? If we have ability of Microsoft MPI, then, is this python code is necessary/unnecessary for parallel computations? Is it valid for earlier versions of SU2 only? I am a bit confused about that issue .

Kindly regards

pcg · January 3, 2021, 09:15

That script was for convenience in the days when you needed to run SU2_SOL after SU2_CFD to get post processing files, and it also tries to automate the task of determining which mpi launcher (mpirun mpiexec) should be used.
In summary, you don't need it.

December 18, 2020, 15:28	Difference of Microsoft MPI and "parallel_computation.py" code	#1
Shbz New Member Join Date: Mar 2016 Posts: 3 Rep Power: 10	Hello I am planning to conduct parallel simulations with SU2. As explained in SU2 website, I downloaded the Microsoft MPI and used the command "mpiexec -n NP SU2_CFD name.cfg" for parallel computation. It used the "parMETIS" substructure in order to divide domain into groups for parallel computations. Then it worked well and conducted a simulation faster than sequential one. However, there is another python code in SU2 called "parallel_computation.py". What is this code for? If we have ability of Microsoft MPI, then, is this python code is necessary/unnecessary for parallel computations? Is it valid for earlier versions of SU2 only? I am a bit confused about that issue . Kindly regards

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January 3, 2021, 09:15		#2
pcg Senior Member Pedro Gomes Join Date: Dec 2017 Posts: 465 Rep Power: 13	That script was for convenience in the days when you needed to run SU2_SOL after SU2_CFD to get post processing files, and it also tries to automate the task of determining which mpi launcher (mpirun mpiexec) should be used. In summary, you don't need it.