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- fftw3 for DEBIAN
- ----------------------
-
- Some of the changes made for version 3 of FFTW necessitated changes to the API,
- so you will need to make (minor) changes when moving existing programs to this
- version. See the documentation (in package fftw3-doc) for details.
-
- In fftw2 separate packages included optimizations for SIMD
- instructions. In fftw3 all such optimizations (x86 and powerpc) are
- included in the regular libraries. The routines should automatically
- detect the capabilities of your processor. Also, the package contains
- three different precision versions (single and double as before, plus
- a new long double version).
-
- The -dev version of a package contains the headers and a statically
- linked copy of the libraries. You need to install this if you intend
- to compile a program which uses fftw. Be careful when compiling
- against the static libs as the library linker (ld) looks for shared
- libraries first. Some people prefer to use static libraries as there
- can be a speed advantage (3-30%) on register starved architectures
- (like x86 machines).
-
- The package also contains a threaded version of fftw.
- Using the threaded version is almost identical to using the non-
- threaded version, but the function calls are renamed and you
- need to call a special function first to handle some housekeeping.
- See the documentation for details.
-
- Unlike fftw2, there are no MPI based libraries at this time. Upstream
- should release them soon. Once upstream adds MPI support, the Debian
- package will include it.
-
- To top it all off, you can call fftw from fortran. See the docs at
- /usr/share/doc/fftw3-doc/html/Calling-FFTW-from-Fortran.html
- (needs package fftw-doc installed).
-
- Checking the fftw library for correctness
- -----------------------------------------
- A 'make check' is run during the Debian build. This runs a number of tests
- on the library but does not test all aspects of fftw.
-
- Some users may want to run more complete checks on the library.
- Unfortunately, it is difficult to compile or run the checks outside
- the source so a precompiled binary is not included with the package.
- To enable users to check the library for correctness, the
- instructions for compiling the source are included here:
- apt-get source fftw3 (you need a deb-src line in /etc/apt/sources.list)
- cd fftw3-3.0
- Run the configure line from debian/rules appropriate for your architecture and
- the precision you would like to test. For example, to run the double precision
- tests on an x86 machine you would run:
- ./configure --prefix=/usr --enable-shared --enable-threads --enable-sse2
- Then compile the source and go into the tests directory:
- make
- cd tests
- You are now ready to run the tests. You can run individual tests yourself or
- you can run the automated tests. For details on running tests yourself, read
- the README file. There are three choices for the automated tests:
- make check (takes a few minutes)
- make bigcheck (takes hours to run)
- make paranoid-check (you tell me how long it takes)
-
- James A. Treacy <treacy@debian.org>, Thu, 24 Apr 2003 21:42:20 -0500
-