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Openmpi SU2 simple parallel install gives problem in iterations

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Old   July 4, 2020, 14:54
Default Openmpi SU2 simple parallel install gives problem in iterations
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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
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Old   July 4, 2020, 18:18
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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.
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Old   July 4, 2020, 18:32
Smile openmpi
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Quote:
Originally Posted by pcg View Post
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.
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Old   July 5, 2020, 08:01
Default Uninstall openmpi and install previous version does not work
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Quote:
Originally Posted by pcg View Post
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 ?
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Old   July 6, 2020, 05:38
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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.
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Old   July 6, 2020, 05:54
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Quote:
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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.

Last edited by steadyman; July 7, 2020 at 02:05.
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