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<h2 class="chapter">6 FFTW on the Cell Processor</h2>
<p><a name="index-Cell-processor-329"></a>
Starting with version 3.2, FFTW contains specific support for the Cell
Broadband Engine (“Cell”) processor, graciously donated by the IBM
Austin Research Laboratory.
<p>Cell consists of one PowerPC core (“PPE”) and of a number of
Synergistic Processing Elements (“SPE”) to which the PPE can
delegate computation. The IBM QS20 Cell blade offers 8 SPEs per Cell
chip. The Sony Playstation 3 contains 6 useable SPEs.
<p>Currently, FFTW fully utilizes the SPEs for one- and multi-dimensional
complex FFTs of sizes that can be factored into small primes, both in
single and double precision. Transforms of real data use SPEs only
partially at this time. If FFTW cannot use the SPEs, it falls back to
a slower computation on the PPE.
<p>FFTW is meant to use the SPEs transparently without user intervention.
However, certain caveats apply, which are discussed later in this
document.
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<li><a accesskey="3" href="FFTW-Accuracy-on-Cell.html#FFTW-Accuracy-on-Cell">FFTW Accuracy on Cell</a>
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