[EMurphy]

Greetings,

I am having problems following the installation of openfoam 6 on my Ubuntu 18.04 build. I should note that there are different mpi's in use on my machine and are in use for different software. I have installed using the directions of

I solved the error of
"gcc: error: unrecognized command line option ‘--showme:link’; did you mean ‘--force-link’?",

when mpirun was called by adding "export WM_MPLIB=OPENMPI" to the file /opt/openfoam6/etc/prefs.sh. This file of course was copied into that director from /opt/openfoam6/etc/config.sh/example/.

However, now when attempting to run a parallel case I obtain,

interFoam: symbol lookup error: /opt/openfoam6/platforms/linux64GccDPInt32Opt/lib/libOpenFOAM.so: undefined symbol: pthread_create.

Any recommendations on how to remedy this would be appreciated. Serial computations work fine.

[wyldckat]

Quick answer:

1. Make sure to use an alias for loading the OpenFOAM 6 shell environment, instead of activating it automatically. More details here: https://openfoamwiki.net/index.php/I...with_the_Shell
2. Remove the "/opt/openfoam6/etc/prefs.sh" file.
3. As root, run the following commands:
   

   ln -s /usr/bin/mpicc.openmpi /opt/openfoam6/bin/mpicc
   ln -s /usr/bin/mpirun.openmpi /opt/openfoam6/bin/mpirun

   This is assuming that the "openmpi" installation defined for these two executables "*.openmpi" is for the default Open-MPI installation in Ubuntu 18.04, given that this is the one used by OpenFOAM 6.
4. Start a new terminal and in this new terminal you can then activate the shell environment for OpenFOAM 6 by calling the respective alias that you should have created in your own "~/.bashrc" file.
   • Do not use other MPI toolboxes in this terminal, unless you really have to, in which case, you may need to use the complete path to them instead of the name alone, e.g.:
     

     /usr/bin/

5. If you want to use other MPI toolboxes without conflict, start another terminal window or tab and work with other software in those other terminals.

If this is not a viable workflow for you, we need more details, in order to figure out a proper installation protocol that works for everyone. For example, which other MPI toolboxes are installed and how do you use them in your somehow-non-conflicting workflow?