title: Reusing FFTW wisdom on clusters
body: <p>I'm running distributed MPI programs on clusters using multiple nodes, where I make use of the MPI FFT's of <a href="http://www.fftw.org/" rel="nofollow noreferrer">FFTW</a>. To save time I reuse <a href="http://www.fftw.org/fftw-wisdom.1.html" rel="nofollow noreferrer">wisdom</a> from one run to the next. To generate this wisdom, FFTW experiments with a lot of different algorithms and what not for the given problem. I am worried that because I am working on a cluster, the best solution stored as wisdom for one set of CPUs/nodes may not be the best solution for some other set of CPUs/nodes performing the same task, and so I should not reuse wisdom unless I am running on exactly the same CPUs/nodes as the run where the wisdom was gathered.</p>
  
  <p>Is this correct, or is the wisdom somehow completely indifferent to the physical hardware on which it is generated?</p>