Hi, I am hoping to use Darshan for analyzing our application's performance. We are using HDF5 and netcdf 4. I installed Darshan version 2.3.1 and mvapich2 for our mpi implementation. Darshan works fine for a standard mpi pingpong application. When we run our application, however, it gives the following error: Darshan failed to map symbol: H5Fopen Darshan failed to map symbol: H5Fopen Darshan failed to map symbol: H5Fopen Darshan failed to map symbol: H5Fopen The four instances of the error probably have to do with the 4 mpi ranks specified at runtime. Nothing is written into the log directory. This is the only output, unless there is some error file I am not aware of. I used the static instrumentation approach for enabling Darshan. Thanks for the help! Thanks, Adnan Haider B.S Candidate, Computer Science Illinois Institute of Technology