FFTW is a C subroutine library for computing the Discrete Fourier Transform (DFT) in one or more dimensions, of arbitrary input size, and of both real and complex data. It is portable and performs well on a wide variety of platforms.
FFTW is available on Ruby, and Owens Clusters. The versions currently available at OSC are:
| Version | Owens | Pitzer | Ascend | Cardinal |
|---|---|---|---|---|
| 3.3.4 | X | |||
| 3.3.5 | X | |||
| 3.3.8 | X* | X* | ||
| 3.3.10 | X | X | X* | X |
You can use module spider fftw2 or module spider fftw3 to view available modules for a given machine. Feel free to contact OSC Help if you need other versions for your work.
FFTW is available to all OSC users. If you have any questions, please contact OSC Help.
www.fftw.org, Open source
Initalizing the system for use of the FFTW library is dependent on the system you are using and the compiler you are using. A successful build of your program will depend on an understanding of what module fits your circumstances. To load a particular version, use module load name . For example, use module load fftw3/3.3.4 to load FFTW3 version 3.3.4. You can use module spider fftw to view available modules.
The following environment variables are setup when the FFTW library is loaded:
| Variable | Use |
|---|---|
$FFTW3_CFLAGS |
Use during your compilation step for C programs. |
$FFTW3_FFLAGS |
Use during your compilation step for Fortran programs. |
$FFTW3_LIBS |
Use during your link step for the sequential version of the library. |
$FFTW3_LIBS_OMP |
Use during your link step for the OpenMP version of the library. |
$FFTW3_LIBS_MPI |
Use during your link step for the MPI version of the library. |
$FFTW3_LIBS_THREADS |
Use during your link step for the "threads" version of the library. |
below is a set of example commands used to build a file called my-fftw.c .
module load fftw3 icc $FFTW3_CFLAGS my-fftw.c -o my-fftw $FFTW3_LIBS ifort $FFTW3_FFLAGS more-fftw.f -o more-fftw $FFTW3_LIBS
Initalizing the system for use of the FFTW library is dependent on the system you are using and the compiler you are using. A successful build of your program will depend on an understanding of what module fits your circumstances. To load a particular version, use module load fftw3/.
The following environment variables are setup when the FFTW library is loaded:
| VARIABLE | USE |
|---|---|
$FFTW3_CFLAGS |
Use during your compilation step for C programs. |
$FFTW3_FFLAGS |
Use during your compilation step for Fortran programs. |
$FFTW3_LIBS |
Use during your link step for the sequential version of the library. |
$FFTW3_LIBS_OMP |
Use during your link step for the OpenMP version of the library. |
$FFTW3_LIBS_MPI |
Use during your link step for the MPI version of the library. |
below is a set of example commands used to build a file called my-fftw.c .
module load fftw3 icc $FFTW3_CFLAGS my-fftw.c -o my-fftw $FFTW3_LIBS ifort $FFTW3_FFLAGS more-fftw.f -o more-fftw $FFTW3_LIBS
Initalizing the system for use of the FFTW library is dependent on the system you are using and the compiler you are using. A successful build of your program will depend on an understanding of what module fits your circumstances. To load a particular version, use module spider fftw3 to check what other modules need to be loaded first. Use module load [module name and version] to load the necessary modules. Then use module load fftw3 to load the default FFTW module version.
The following environment variables are setup when the FFTW library is loaded:
| VARIABLE | USE |
|---|---|
$FFTW3_CFLAGS |
Use during your compilation step for C programs. |
$FFTW3_FFLAGS |
Use during your compilation step for Fortran programs. |
$FFTW3_LIBS |
Use during your link step for the sequential version of the library. |
$FFTW3_LIBS_OMP |
Use during your link step for the OpenMP version of the library. |
$FFTW3_LIBS_MPI |
Use during your link step for the MPI version of the library. |
below is a set of example commands used to build a file called my-fftw.c .
module load fftw3 icc $FFTW3_CFLAGS my-fftw.c -o my-fftw $FFTW3_LIBS ifort $FFTW3_FFLAGS more-fftw.f -o more-fftw $FFTW3_LIBS