[CIG-SEISMO] SPECFEM3D Globe verification

[Luo, Ping]

Hello,

We are going to use SPECFEM3D Globe as a benchmark for new cluster purchase. I have built SPECFEM3D Globe one a Sandy Bridge cluster and am running "small_benchmark_run_to_test_a_new_machine" from the EXAMPLES directory. In the README file, it mentions that "If you notice any difference on any of the 387 pages, the code on your new machine (or your new machine, or both) has a problem." I indeed find my simulation results are a little different from the reference values. I am attaching one graph where the two sets of results seems off the most. The files attached are:

     BBSR.IU.MXE.sem.ascii
     BBSR.IU.MXE.sem.ascii-ref
     BBSR_IU_MXE.seismograms_comparison.pdf


Do you think there is something wrong with my simulation? What could be the problem? Since we are only interested in relative performance among different clusters, is it OK to use SPECFEM3D Globe as a benchmark of cluster selection even though the results are not correct?

I used the Intel XE compilers and the intel MPI for compilation. I didn't change the default compilation flags.

Thank you for help,

Sincerely,

Ping
Lead Systems Administrator
Supercomputing Facility
Texas A&M University
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