My project binary could not find libmpi.so.12

[giuseppe998e]

Hi, I am currently trying to run the rsmpi time.rs example on a machine with Spark installed. To do this, I have installed the following packages: [email protected], [email protected], [email protected] and [email protected]. However, when I try to run cargo run for the project, I encounter the following error:

target/release/rust_openmpi_test: error while loading shared libraries: libmpi.so.12: cannot open shared object file: No such file or directory

I checked my system and found that I only have libmpi.so.40.
And from what I can gather, the library mentioned in the error is at least six years old.

Do you know how I can solve it?

[jedbrown]

If you have mpich installed, then there is also libmpi.so.12. The problem is that detection found the build toolchain for MPICH, but the MPICH directories are not in your default search path. Probably setting LD_LIBRARY_PATH to point at your /path/to/mpich/lib will allow you to run. Alternatively, you can cargo clean and make sure it's the Open MPI tools that get found.

[giuseppe998e]

I can confirm that Spack does not add the libmpi.so.12' library from [email protected]' to the `LD_LIBRARY_PATH' as it should.
If I find how to fix it I will update the answer, maybe it could be helpful to others, thanks!

[jedbrown]

You can use Spack environments or modules for such things. It depends how much spack you want in your food.

[giuseppe998e]

Oh thank you for the clarification, I am learning it, I have to stay with Spack.