Installing FFTW

Procedure

1. Use PuTTY to log in to the server as the root user.
2. Decompress the FFTW installation package.

   tar -xvf fftw-3.3.8.tar.gz

3. Go to the directory generated after the decompression.

   cd fftw-3.3.8

4. Perform the configuration.

   export CC=`which clang`
   export CXX=`which clang++`
   export FC=`which flang`
   ./configure --prefix=/path/to/FFTW --enable-shared --enable-static --enable-fma --enable-neon

5. Perform the compilation and installation.

   make -j 96
   make install

6. Edit the environment variable file.

   vi ~/.bashrc

7. Press i to enter the edit mode and run the following commands to load the environment variables.

   export PATH=/path/to/FFTW/bin:$PATH
   export LD_LIBRARY_PATH=/path/to/FFTW/lib:$LD_LIBRARY_PATH

8. Press Esc, type :wq!, and press Enter to save the file and exit.
9. Make the environment variables take effect.

   source ~/.bashrc