运行RegCM大气模型时遇libmpi_mpifh.so.12加载失败问题求助

Let's break down why this error is popping up and walk through practical fixes to get your RegCM model running smoothly.

Why this happens #

The error means your system can’t locate the libmpi_mpifh.so.12 shared library. This file is tied to a specific version of OpenMPI—usually the 3.x series (like 3.1.x). The openmpi-dev and libopenmpi packages you installed are probably a newer or older version that doesn’t include this exact library file.

Step 1: Check if the library exists on your system #

First, let’s confirm whether the library is already hiding somewhere on your machine. Run this search command:

find / -name libmpi_mpifh.so.12 2>/dev/null

• If the command returns a path (e.g., /usr/lib/x86_64-linux-gnu/openmpi/lib/libmpi_mpifh.so.12), skip to Step 3.
• If no results show up, the library isn’t installed—head to Step 2.

Step 2: Install the correct OpenMPI version #

Since libmpi_mpifh.so.12 belongs to OpenMPI 3.x, we’ll install that specific version to match:

1. First, remove existing OpenMPI packages to avoid conflicts:

   sudo apt-get purge openmpi-dev libopenmpi*
   

2. Install the 3.x version of OpenMPI:

   sudo apt-get install libopenmpi3 libopenmpi-dev
   

This should install the exact missing library onto your system.

Step 3: Add the library path to your system’s search path #

If you found the library in Step 1 but still get the error, it means your system isn’t checking the right directory for it. We’ll add the library’s path to LD_LIBRARY_PATH:

• Temporary fix (works only for your current terminal session):
  Replace /path/to/mpi/lib with the actual path you found in Step 1, then run:

  export LD_LIBRARY_PATH=/path/to/mpi/lib:$LD_LIBRARY_PATH
  ./regcmMPI
  

• Permanent fix (applies to all future sessions):
  Open your ~/.bashrc file with a text editor:

  nano ~/.bashrc
  

  Add this line at the end (replace the path with your actual library path):

  export LD_LIBRARY_PATH=/path/to/mpi/lib:$LD_LIBRARY_PATH
  

  Save and exit, then reload the file to apply changes:

  source ~/.bashrc
  

Step 4: Recompile RegCM with the correct MPI (if needed) #

If you still hit issues, it’s possible RegCM was compiled with a different MPI version than what’s on your system now. To fix this:

1. Navigate to your RegCM source directory.
2. Clean previous build files:

   make clean
   

3. Reconfigure RegCM to use your current MPI setup. If you installed via apt, run:

   ./configure --with-mpi
   

   If you compiled MPI from source, specify its installation path:

   ./configure --with-mpi=/path/to/your/mpi/installation
   

4. Recompile and install:

   make
   make install
   

Try these steps in order—most likely Step 2 or 3 will resolve your issue quickly.

内容的提问来源于stack exchange，提问作者Carlos Madrigal