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    • Andreas Marek's avatar
      Check the provided threading level of the MPI library · 82ad3340
      Andreas Marek authored
      It turned out that users ignored the warnings of the test programs
      if their MPI library did not provide "MPI_THREAD_SERIALIED" or
      "MPI_THREAD_MULTIPLE".
      
      Thus for safty reasons, ELPA does from now on during the call to
      "elpa_setup" check the provided threading level of the MPI library.
      If the provided level is too low, ELPA will do the following
      
      - limit the number of OpenMP threads **internal** to ELPA to 1
      - print a warning about this
      - ignore the settings of the user via
      -- the OMP_NUM_THREADS variable
      -- calling the set-method set("omp_threads", value)
      
      These settings will **not** affect the run-time of a threaded
      blas and lapack library, **if** the number of threads for these
      libraries can be controlled independently of the OMP_NUM_THREADS
      variable (for example for Intel's MKL one can use MKL_NUM_THREADS)
      82ad3340
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