[steadyman]

Hello everyone

I use ubuntu 18.04 LTS.
I download SU2 linux 7.0.5 Blackbird for parallel computation. I have written necessary paths in my .bashrc.

For serial it works fine.

For parallel it gives the following parallel_openmpi_problem.png

I have read some comments but it states error due to SU2 compilation. However, for simple install we have no compilation process as stated here https://su2code.github.io/docs_v7/SU2-Linux-MacOS/

. It works with MPICH fine but If I use OPENMPI it gives same iteration numbers as in parallel_openmpi_problem.png

Thanks in advance

[pcg]

That usually happens when the version of mpi used to run the code is different from the one used to compile it.

Generally it is not a very good idea to have two mpi distributions visible at the same time, if possible pick either mpich or openmpi.

[steadyman]

Originally Posted by pcg

That usually happens when the version of mpi used to run the code is different from the one used to compile it.

Generally it is not a very good idea to have two mpi distributions visible at the same time, if possible pick either mpich or openmpi.

I have just installed openmpi no MPICH is installed on my PC.

[steadyman]

Originally Posted by pcg

That usually happens when the version of mpi used to run the code is different from the one used to compile it.

Generally it is not a very good idea to have two mpi distributions visible at the same time, if possible pick either mpich or openmpi.

I have changed my openmpi version by uninstalling new and replacing with the old one. Here is my openmpi version openmpi_version.png


I tell step by step what I have done after changing openmpi version

1.Again my serial SU2 works fine but in parallel (it is simple installed not built in source) it gives parallel_computation_error.png

I think it is not about SU2 it is all about openmpi issue. Because I have 4 processors and I can run only 2 of them with mpirun. If I try to run it gives this again parallel_computation_error.png
2. I install mpi4py. Then I can run all 4 processors but they all give this after_installing_mpi4py.png


How can I solve this openmpi issue again I do not think it is nothing with SU2 ?

[pcg]

Maybe you have 2 physical cores with hyperthreading? In which case you see 4 cores but for computationally intensive tasks you should use only 2.
Usually OpenMPI detects the number of physical cores and complains if you try to use more.

[steadyman]

Originally Posted by pcg

Maybe you have 2 physical cores with hyperthreading? In which case you see 4 cores but for computationally intensive tasks you should use only 2.
Usually OpenMPI detects the number of physical cores and complains if you try to use more.

After installing mpi4py I can run 4 cores however problem occurs related to repetitive iterations as I stated my last shared picture.

[S_teph_2000]

Hello Steadyman,

1Year has passed since your last post...did you find a solution?
I am experiencing the same "repetitive iterations" problem for more than 1 core calculation with Ubuntu.

Kazu

[steadyman]

Originally Posted by S_teph_2000

Hello Steadyman,

1Year has passed since your last post...did you find a solution?
I am experiencing the same "repetitive iterations" problem for more than 1 core calculation with Ubuntu.

Kazu

Hello Kazu

I left using opnmpi and I will start use MPICH to solve this problem.

Best