It is likely just a matter of using the mpiexec in PATH (e.g. /usr/bin) instead of /home/yujie/codes/mpich2/bin/mpiexec. Note that either mpicc links with RPATH (MPICH2), or mpiexec sets up the environment so that the correct libraries are found (Open MPI; LD_LIBRARY_PATH may change in which case mpiexec -n 1 ./app works, but ./app doesn't) so shared libs should work correctly even if you don't modify LD_LIBRARY_PATH by hand. IIRC, libmesh always links with RPATH (and PETSc certainly does).
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