ses the uniprocessor
FFTW can therefore be trivially modified to use the multi-threaded
FFTW.

   <p>A shared-memory machine is one in which all CPUs can directly access
the same main memory, and such machines are now common due to the
ubiquity of multi-core CPUs.  FFTW's multi-threading support allows
you to utilize these additional CPUs transparently from a single
program.  However, this does not necessarily translate into
performance gains&mdash;when multiple threads/CPUs are employed, there is
an overhe