197 lines
6.9 KiB
Groff
197 lines
6.9 KiB
Groff
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.\"
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.\" Copyright (c) 2003, 2007-14 Matteo Frigo
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.\" Copyright (c) 2003, 2007-14 Massachusetts Institute of Technology
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.\"
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.\" This program is free software; you can redistribute it and/or modify
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.\" it under the terms of the GNU General Public License as published by
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.\" the Free Software Foundation; either version 2 of the License, or
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.\" (at your option) any later version.
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.\"
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.\" This program is distributed in the hope that it will be useful,
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.\" but WITHOUT ANY WARRANTY; without even the implied warranty of
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.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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.\" GNU General Public License for more details.
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.\"
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.\" You should have received a copy of the GNU General Public License
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.\" along with this program; if not, write to the Free Software
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.\" Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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.\"
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.TH FFTW-WISDOM 1 "February, 2003" "fftw" "fftw"
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.SH NAME
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fftw@PREC_SUFFIX@\-wisdom \- create wisdom (pre-optimized FFTs)
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.SH SYNOPSIS
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.B fftw@PREC_SUFFIX@\-wisdom
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[\fIOPTION\fR]... [\fISIZE\fR]...
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.SH DESCRIPTION
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.PP
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.\" Add any additional description here
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.I fftw@PREC_SUFFIX@\-wisdom
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is a utility to generate FFTW
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.B wisdom
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files, which contain saved information about how to optimally compute
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(Fourier) transforms of various sizes. FFTW is a free library to
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compute discrete Fourier transforms in one or more dimensions, for
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arbitrary sizes, and of both real and complex data, among other
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related operations. More information on FFTW can be found at the FFTW
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home page:
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.I http://www.fftw.org
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Programs using FFTW can be written to load wisdom from an arbitrary file,
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string, or other source. Moreover, it is likely that many FFTW-using
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programs will load the \fBsystem wisdom\fR file, which is stored in
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.I /etc/fftw/wisdom@PREC_SUFFIX@
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by default.
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.I fftw@PREC_SUFFIX@\-wisdom
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can be used to create or add to such wisdom files. In its most
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typical usage, the wisdom file can be created to pre-plan a canonical
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set of sizes (see below) via:
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.ce
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fftw@PREC_SUFFIX@\-wisdom \-v \-c \-o wisdom@PREC_SUFFIX@
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(this will take many hours, which can be limited by the
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.B \-t
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option) and the output
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.I wisdom@PREC_SUFFIX@
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file can then be copied (as root) to
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.I /etc/fftw/
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or whatever.
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The
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.I fftw@PREC_SUFFIX@\-wisdom
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program normally writes the wisdom directly to standard output, but this
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can be changed via the
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.B \-o
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option, as in the example above.
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If the system wisdom file
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.I /etc/fftw/wisdom@PREC_SUFFIX@
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already exists, then
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.I fftw@PREC_SUFFIX@\-wisdom
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reads this existing wisdom (unless the
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.B \-n
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option is specified) and outputs both the old wisdom and any
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newly created wisdom. In this way, it can be used to add new transform
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sizes to the existing system wisdom (or other wisdom file, with the
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.B \-w
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option).
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.SH SPECIFYING SIZES
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Although a canonical set of sizes to optimize is specified by the
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.B \-c
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option, the user can also specify zero or more non-canonical transform
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sizes and types to optimize, via the
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.I SIZE
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arguments following the option flags. Alternatively, the sizes to
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optimize can be read from standard input (whitespace-separated), if a
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.I SIZE
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argument of "\-" is supplied.
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Sizes are specified by the syntax:
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.ce
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<\fItype\fR><\fIinplace\fR><\fIdirection\fR><\fIgeometry\fR>
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<\fItype\fR> is either \'c\' (complex), \'r\' (real, r2c/c2r), or
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\'k\' (r2r, per-dimension kinds, specified in the geometry, below).
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<\fIinplace\fR> is either \'i\' (in place) or \'o\' (out of place).
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<\fIdirection\fR> is either \'f\' (forward) or \'b\' (backward). The
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<\fIdirection\fR> should be omitted for \'k\' transforms, where it is
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specified via the geometry instead.
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<\fIgeometry\fR> is the size and dimensionality of the transform,
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where different dimensions are separated by \'x\' (e.g. \'16x32\' for
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a two-dimensional 16 by 32 transform). In the case of \'k\'
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transforms, the size of each dimension is followed by a "type" string,
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which can be one of f/b/h/e00/e01/e10/e11/o00/o01/o10/o11 for
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R2HC/HC2R/DHT/REDFT00/.../RODFT11, respectively, as defined in the
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FFTW manual.
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For example, \'cif12x13x14\' is a three-dimensional 12 by 13 x 14
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complex DFT operating in-place. \'rob65536\' is a one-dimensional
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size-65536 out-of-place complex-to-real (backwards) transform
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operating on Hermitian-symmetry input. \'ki10hx20e01\' is a
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two-dimensional 10 by 20 r2r transform where the first dimension is a
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DHT and the second dimension is an REDFT01 (DCT-III).
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.SH OPTIONS
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.TP
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\fB\-h\fR, \fB\-\-help\fR
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Display help on the command-line options and usage.
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.TP
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\fB\-V\fR, \fB\-\-version\fR
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Print the version number and copyright information.
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.TP
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\fB\-v\fR, \fB\-\-verbose\fR
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Verbose output. (You can specify this multiple times, or supply a numeric
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argument greater than 1, to increase the verbosity level.) Note that the
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verbose output will be mixed with the wisdom output (making it impossible
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to import), unless you write the wisdom to a file via the
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.B \-o
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option.
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.TP
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\fB\-c\fR, \fB\-\-canonical\fR
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Optimize/pre-plan a canonical set of sizes: all powers of two and ten
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up to 2^20 (1048576), including both real and complex, forward and
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backwards, in-place and out-of-place transforms. Also includes two-
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and three-dimensional transforms of equal-size dimensions
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(e.g. 16x16x16).
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.TP
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\fB\-t\fR \fIhours\fR, \fB\-\-time\-limit\fR=\fIhours\fR
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Stop after a time of
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.I hours
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(hours) has elapsed, outputting accumulated wisdom. (The problems are planned
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in increasing order of size.) Defaults to 0, indicating no time limit.
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.TP
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\fB\-o\fR \fIfile\fR, \fB\-\-output-file\fR=\fIfile\fR
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Send wisdom output to
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.I file
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rather than to standard output (the default).
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.TP
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\fB\-m\fR, \fB\-\-measure\fR; \fB\-e\fR, \fB\-\-estimate\fR; \fB\-x\fR, \fB\-\-exhaustive\fR
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Normally,
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.I fftw@PREC_SUFFIX@\-wisdom
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creates plans in FFTW_PATIENT mode, but with these options you can instead
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use FFTW_MEASURE, FFTW_ESTIMATE, or FFTW_EXHAUSTIVE modes, respectively,
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as described in more detail by the FFTW manual.
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Note that wisdom is tagged with the planning patience level, and a
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single file can mix different levels of wisdom (e.g. you can mostly
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use the patient default, but plan a few sizes that you especially care
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about in
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.B \-\-exhaustive
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mode).
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.TP
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\fB\-n\fR, \fB\-\-no\-system\-wisdom\fR
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Do not import the system wisdom from
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.I /etc/fftw/wisdom@PREC_SUFFIX@
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(which is normally read by default).
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.TP
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\fB\-w\fR \fIfile\fR, \fB\-\-wisdom\-file\fR=\fIfile\fR
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Import wisdom from
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.I file
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(in addition to the system wisdom, unless
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.B \-n
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is specified). Multiple wisdom files can be read via multiple
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.B \-w
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options. If
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.I file
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is "\-", then read wisdom from standard input.
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.TP
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\fB\-T\fR \fIN\fR, \fB\--threads\fR=\fIN\fR
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Plan with
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.I N
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threads. This option is only present if FFTW was configured with
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thread support.
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.SH BUGS
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Send bug reports to fftw@fftw.org.
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.SH AUTHORS
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Written by Steven G. Johnson and Matteo Frigo.
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Copyright (c) 2003, 2007-14 Matteo Frigo
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.br
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Copyright (c) 2003, 2007-14 Massachusetts Institute of Technology
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.SH "SEE ALSO"
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fftw-wisdom-to-conf(1)
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