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i7-2600_gcc-4.4.5_x64_Debian6.md

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Debian 6, gcc 4.4.5, 64-bit, fftw 3.3.1 on a 3.4 GHz core i7 2600

Built with:

gcc -o test_pffft -DHAVE_FFTW -msse2 -O3 -Wall -W pffft.c test_pffft.c fftpack.c -L$HOME/local/lib -I$HOME/local/include/ -lfftw3f -lm
N (input length) real FFTPack real FFTW real PFFFT cplx FFTPack cplx FFTW cplx PFFFT
64 3840 7680 8777 4389 20480 11171
96 4214 9633 8429 4816 22477 11238
128 3584 10240 10240 5120 23893 11947
192 4854 11095 12945 4854 22191 14121
256 4096 11703 16384 5120 23406 13653
384 4395 14651 12558 4884 19535 14651
512 5760 13166 15360 4608 23040 15360
768 4907 14020 16357 4461 19628 14020
1024 5120 14629 14629 5120 20480 15754
2048 5632 14080 18773 4693 12516 16091
4096 5120 13653 17554 4726 7680 14456
8192 4160 7396 13312 4437 14791 13312
9216 4210 6124 13473 4491 7282 14970
16384 3976 11010 14313 4210 11450 13631
32768 4260 10224 10954 4260 6816 11797
262144 3736 6896 9961 2359 8965 9437
1048576 2796 4534 6453 1864 3078 5592