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<h2 class="chapter">5 Parallel FFTW</h2>
<p><a name="index-parallel-transform-307"></a>In this chapter we discuss the use of FFTW in a parallel environment.
<p>Currently, FFTW 3 includes parallel transforms for shared-memory
machines with some flavor of threads (e.g. POSIX threads); any program
using FFTW can be trivially modified to use these transforms, which are
documented in <a href="Multi_002dthreaded-FFTW.html#Multi_002dthreaded-FFTW">Multi-threaded FFTW</a>.
<p>Users calling FFTW from a multi-threaded program should also consult
<a href="Thread-safety.html#Thread-safety">Thread safety</a>. This section tells you which routines of FFTW it
is safe to call in parallel from different shared-memory threads.
<p>FFTW 2 also contains distributed-memory parallel transforms using the
MPI message-passing standard. MPI transforms are not yet available in
FFTW 3, so users requiring that capability must use FFTW 2 for now.
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