Openmpi broken after Ubuntu upgrade to version 22.04

 When you encounter issues with OpenMPI (Message Passing Interface) after upgrading Ubuntu to version 22.04, it's essential to troubleshoot and resolve them. Here are some general steps to address this problem:


1. **Check for Compatibility**:

   - Verify that the OpenMPI version you had installed is compatible with Ubuntu 22.04. If it's not, consider upgrading to a version that is compatible.


2. **Reinstall OpenMPI**:

   - In some cases, it might be necessary to reinstall OpenMPI to ensure all components are compatible with the new Ubuntu version.

     ```bash

     sudo apt update

     sudo apt install openmpi-bin libopenmpi-dev

     ```


3. **Rebuild Applications**:

   - If you have custom applications or software that depend on OpenMPI, make sure to rebuild or recompile them to ensure compatibility with the new OpenMPI version.


4. **Check System Libraries and Dependencies**:

   - Review the system libraries and dependencies required by your MPI applications. Ensure they are correctly configured and compatible with the upgraded system.


5. **Recompile MPI Applications**:

   - Recompile your MPI applications using the updated OpenMPI libraries and headers. Make sure you use the correct MPI compiler wrapper (`mpicc`, `mpicxx`, `mpifort`, etc.) provided by the new OpenMPI installation.


6. **Check Environment Variables**:

   - Verify that your environment variables related to OpenMPI are correctly set. This includes `PATH`, `LD_LIBRARY_PATH`, and other relevant variables. Update them if needed.


7. **Check for Known Issues**:

   - Check for any known issues or release notes related to the specific version of OpenMPI and Ubuntu 22.04. Developers often provide information about compatibility and known problems.


8. **Test with Basic MPI Programs**:

   - To isolate the issue, test with basic MPI programs to check if MPI functionality is working as expected. For example, you can use a simple "Hello, World" MPI program to ensure that MPI itself is functioning properly.


9. **Check Configuration Files**:

   - Review any configuration files that may be relevant to OpenMPI and update them as needed.


10. **Consult OpenMPI Community**:

    - If you can't resolve the issue on your own, consider seeking help from the OpenMPI community or forums where experts can provide specific guidance based on your problem.


11. **Downgrade or Use Containers**:

    - As a temporary solution, you may consider downgrading Ubuntu to the previous version where OpenMPI was working correctly. Alternatively, consider using containerization (e.g., Docker) to create isolated environments for your MPI applications.


12. **Monitor for Updates**:

    - Keep an eye on updates and patches for Ubuntu and OpenMPI. Issues you encounter may get resolved in future updates.


Remember to back up your data and configurations before making any significant changes to your system. This will help you recover in case you run into more issues. It's essential to thoroughly investigate and address the root cause of the problem to ensure long-term stability and compatibility.

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