At the moment, I'm installing the "GADGET-2" application. In its documentation it says "Note that the MPI-capable version 2.x of FFTW is required, the new version 3 lacks MPI capability at this point. FFTW is only needed for simulations that use the TreePM algorithm."

Is this still true for the current version 3.3.3? Should I use 2.1.5 or 3.3.3?

Thank you!


1 Answer 1


FFTW3 now supports MPI, but the APIs between 2 and 3 have many differences. Thus, I'm 99% certain you should use FFTW2. However, if you ask around, you may be able to find a usable version of Gadget-3 which has been slated for but not yet officially released for awhile now. We see a lot of both on our systems.

  • $\begingroup$ Thank you! I will give it a try with FFTW 2.1.5 and if this does not work, I will go vor GADGET-3 $\endgroup$
    – strauberry
    Commented Feb 19, 2014 at 21:01

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