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1 This directory contains a benchmarking and testing program
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2 for fftw3.
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3
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4 The `bench' program has a zillion options, because we use it for
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5 benchmarking other FFT libraries as well. This file only documents
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6 the basic usage of bench.
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7
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8 Usage: bench <commands>
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9
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10 where each command is as follows:
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11
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12 -s <problem>
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13 --speed <problem>
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14
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15 Benchmarks the speed of <problem>.
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16
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17 The syntax for problems is [i|o][r|c][f|b]<size>, where
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18
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19 i/o means in-place or out-of-place. Out of place is the default.
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20 r/c means real or complex transform. Complex is the default.
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21 f/b means forward or backward transform. Forward is the default.
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22 <size> is an arbitrary multidimensional sequence of integers
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23 separated by the character 'x'.
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24
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25 (The syntax for problems is actually richer, but we do not document
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26 it here. See the man page for fftw-wisdom for more information.)
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27
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28 Example:
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29
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30 ib256 : in-place backward complex transform of size 256
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31 32x64 : out-of-place forward complex 2D transform of 32 rows
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32 and 64 columns.
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33
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34 -y <problem>
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35 --verify <problem>
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36
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37 Verify that FFTW is computing the correct answer.
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38
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39 The program does not output anything unless an error occurs or
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40 verbosity is at least one.
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41
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42 -v<n>
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43
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44 Set verbosity to <n>, or 1 if <n> is omitted. -v2 will output
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45 the created plans with fftw_print_plan.
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46
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47 -oestimate
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48 -opatient
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49 -oexhaustive
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50
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51 Plan with FFTW_ESTIMATE, FFTW_PATIENT, or FFTW_EXHAUSTIVE, respectively.
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52 The default is FFTW_MEASURE.
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53
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54 If you benchmark FFTW, please use -opatient.
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55
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56 -onthreads=N
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57
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58 Use N threads, if FFTW was compiled with --enable-threads. N
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59 must be a positive integer; the default is N=1.
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60
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61 -onosimd
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62
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63 Disable SIMD instructions (e.g. SSE or SSE2).
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64
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65 -ounaligned
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66
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67 Plan with the FFTW_UNALIGNED flag.
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68
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69 -owisdom
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70
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71 On startup, read wisdom from a file wis.dat in the current directory
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72 (if it exists). On completion, write accumulated wisdom to wis.dat
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73 (overwriting any existing file of that name).
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