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FFTW
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| FFTW (Fastest Fourier Transform in the West) is a free collection of fast C routines for computing the Discrete Fourier Transform in one or more dimensions. It includes complex, real, symmetric and parallel transforms and can handle arbitrary array sizes efficiently. FFTW is typically faster than other publically-available FFT implementations and is even competitive with vendor-tuned libraries. |
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Using FFTW on Nehalem cluster:
There are four versions of FFTW instaled on Nehalem cluster:
- intel single and double precision
- gnu single and double precision
Load the needed modules (e.g. in case of the intel double precision version):
module load compiler/gnu/4.4.3
module load compiler/intel/11.1
module load mpi/openmpi/1.4.1-intel-11.1 (only if mpi programs are compiled)
module load unsupported-modules
module load numlib/fftw/3.2.2_double-openmpi-1.4.1-intel-11.1
#the command "module avail numlib" lists the available fftw modules:
#numlib/fftw/3.2.2_double-openmpi-1.4.1-gnu-4.4.3
#numlib/fftw/3.2.2_double-openmpi-1.4.1-intel-11.1
#numlib/fftw/3.2.2_single-openmpi-1.4.1-gnu-4.4.3
#numlib/fftw/3.2.2_single-openmpi-1.4.1-intel-11.1