fftw_cell_set_nspe(n)
, where n
is the number of desired
SPEs. Expect this interface to go away once we figure out how to
make FFTW play nicely with other Cell software.
In particular, if you try to link both the single and double precision of FFTW in the same program (which you can do), they will both try to grab all SPEs and the second one will hang.
FFTW_ESTIMATE
mode may produce seriously suboptimal plans, and
it becomes particularly confused if you enable both the SPEs and
Altivec. If you care about performance, please use FFTW_MEASURE
or FFTW_PATIENT
until we figure out a more reliable performance model.