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