cannam@127: cannam@127: cannam@127: cannam@127: cannam@127: cannam@127: FFTW 3.3.5: Installation and Supported Hardware/Software cannam@127: cannam@127: cannam@127: cannam@127: cannam@127: cannam@127: cannam@127: cannam@127: cannam@127: cannam@127: cannam@127: cannam@127: cannam@127: cannam@127: cannam@127: cannam@127: cannam@127: cannam@127: cannam@127: cannam@127: cannam@127:
cannam@127:

cannam@127: Next: , Previous: , Up: Multi-threaded FFTW   [Contents][Index]

cannam@127:
cannam@127:
cannam@127: cannam@127:

5.1 Installation and Supported Hardware/Software

cannam@127: cannam@127:

All of the FFTW threads code is located in the threads cannam@127: subdirectory of the FFTW package. On Unix systems, the FFTW threads cannam@127: libraries and header files can be automatically configured, compiled, cannam@127: and installed along with the uniprocessor FFTW libraries simply by cannam@127: including --enable-threads in the flags to the configure cannam@127: script (see Installation on Unix), or --enable-openmp to use cannam@127: OpenMP threads. cannam@127: cannam@127:

cannam@127: cannam@127: cannam@127: cannam@127:

The threads routines require your operating system to have some sort cannam@127: of shared-memory threads support. Specifically, the FFTW threads cannam@127: package works with POSIX threads (available on most Unix variants, cannam@127: from GNU/Linux to MacOS X) and Win32 threads. OpenMP threads, which cannam@127: are supported in many common compilers (e.g. gcc) are also supported, cannam@127: and may give better performance on some systems. (OpenMP threads are cannam@127: also useful if you are employing OpenMP in your own code, in order to cannam@127: minimize conflicts between threading models.) If you have a cannam@127: shared-memory machine that uses a different threads API, it should be cannam@127: a simple matter of programming to include support for it; see the file cannam@127: threads/threads.c for more detail. cannam@127:

cannam@127:

You can compile FFTW with both --enable-threads and cannam@127: --enable-openmp at the same time, since they install libraries cannam@127: with different names (‘fftw3_threads’ and ‘fftw3_omp’, as cannam@127: described below). However, your programs may only link to one cannam@127: of these two libraries at a time. cannam@127:

cannam@127:

Ideally, of course, you should also have multiple processors in order to cannam@127: get any benefit from the threaded transforms. cannam@127:

cannam@127: cannam@127: cannam@127: cannam@127: cannam@127: