[CP2K-user] [CP2K:22304] Troubleshooting: changing periodicity and index to radix array not found

Stein, Dr. Frederick f.stein at hzdr.de
Thu Jul 9 15:24:52 UTC 2026


Dear Michela,
Sorry for the long time to respond. I guess it is just a very special 
question.
Your system may be too large for the internal FFT library. Please consider 
PREFERRED_FFT_LIBRARY FFTW3. I have just run the calculation with FFTW3 but 
replaced your system with hydrogen such that the underlying FFT-grids should 
be the same. If you still observe an error, could you increase the print 
level and send a suitable output file.
Best,
Frederick

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