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The correct installation will show ldd of mpiXX.so as:

 

(lcls2_base) monarin@nid02517:~$ ldd /img/conda.local/miniconda3/envs/lcls2_base/lib/python3.7/site-packages/mpi4py/MPI.cpython-37m-x86_64-linux-gnu.so 

...

 libz.so.1 => /opt/udiImage/modules/mpich/lib64/dep/libz.so.1 (0x00002aaaad204000)



Note that after pulling a shifter image, the LD_LIBRARY_PATH gets set to:

(lcls2_base) monarin@nid02517:~$ echo $LD_LIBRARY_PATH

/opt/udiImage/modules/mpich/lib64