74 lines
2 KiB
Plaintext
74 lines
2 KiB
Plaintext
This directory contains a benchmarking and testing program
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for fftw3.
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The `bench' program has a zillion options, because we use it for
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benchmarking other FFT libraries as well. This file only documents
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the basic usage of bench.
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Usage: bench <commands>
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where each command is as follows:
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-s <problem>
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--speed <problem>
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Benchmarks the speed of <problem>.
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The syntax for problems is [i|o][r|c][f|b]<size>, where
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i/o means in-place or out-of-place. Out of place is the default.
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r/c means real or complex transform. Complex is the default.
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f/b means forward or backward transform. Forward is the default.
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<size> is an arbitrary multidimensional sequence of integers
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separated by the character 'x'.
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(The syntax for problems is actually richer, but we do not document
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it here. See the man page for fftw-wisdom for more information.)
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Example:
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ib256 : in-place backward complex transform of size 256
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32x64 : out-of-place forward complex 2D transform of 32 rows
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and 64 columns.
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-y <problem>
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--verify <problem>
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Verify that FFTW is computing the correct answer.
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The program does not output anything unless an error occurs or
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verbosity is at least one.
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-v<n>
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Set verbosity to <n>, or 1 if <n> is omitted. -v2 will output
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the created plans with fftw_print_plan.
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-oestimate
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-opatient
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-oexhaustive
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Plan with FFTW_ESTIMATE, FFTW_PATIENT, or FFTW_EXHAUSTIVE, respectively.
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The default is FFTW_MEASURE.
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If you benchmark FFTW, please use -opatient.
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-onthreads=N
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Use N threads, if FFTW was compiled with --enable-threads. N
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must be a positive integer; the default is N=1.
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-onosimd
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Disable SIMD instructions (e.g. SSE or SSE2).
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-ounaligned
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Plan with the FFTW_UNALIGNED flag.
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-owisdom
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On startup, read wisdom from a file wis.dat in the current directory
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(if it exists). On completion, write accumulated wisdom to wis.dat
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(overwriting any existing file of that name).
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