ld choose your transform size in
order to load balance.
</p>
<p>Load balancing is especially difficult when you are parallelizing over
heterogeneous machines; for example, if one of your processors is a
old 486 and another is a Pentium IV, obviously you should give the
Pentium more work to do than the 486 since the latter is much slower.
FFTW does not deal with this problem, however&mdash;it assumes that your
processes run on hardware of comparable speed, and that the goal is
therefore to divide the problem