FAQ

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* SWEET takes long to startup
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  FFTW can take some seconts to setup the plans.
  To overcome this, set the environemtn variable SWEET_FFTW_ESTIMATE

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* GL library not found during linking stage
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  On Ubuntu systems, install the libgl1-mesa-dev package.
  


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* SWEET behaves differently in performance everytime it's executed
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  One of the reasons can be that FFTW is choosing different plans
  everytime a SWEET program is started.
  To avoid this, SWEET supports loading plans from wisdom files.
  Set the environment variable SWEET_FFTW_LOAD_WISDOM_FROM_FILE to
  the wisdom file which you can generate with `fftw-wisdom`

  Another reason can be a pinning problem of the threads to the cores.
  If you run simulations on multi-socket machines, this can easily
  result in varying performance.
  Use OMP_PROC_BIND=TRUE to bind threads to cores

  In case of activated frequency scaling, it might be necessary
  to deactivate this.