[gmx-users] [Fwd: [FFTW-announce] FFTW 3.2 is released]

Mark Abraham Mark.Abraham at anu.edu.au
Sun Nov 16 12:47:07 CET 2008

Apologies to people receiving this from the FFTW list too, but it should 
be of interest to a large slice of people using GROMACS. In particular, 
the improvements for SIMD and size of multiples of 5/10 should be of 
value for lots of people.

Does anyone (Carsten?) have an off-the-cuff opinion on whether the 
latter means that FFT grids with dimensions that are multiples of 5 
might now be more desirable? How might that affect PME load-splitting?


-------- Original Message --------
Subject: [FFTW-announce] FFTW 3.2 is released
Date: Sat, 15 Nov 2008 22:01:44 -0500 (EST)
From: Steven G. Johnson <stevenj at ab-initio.mit.edu>
Reply-To: Steven G. Johnson <stevenj at alum.mit.edu>
To: fftw-announce at fftw.org

Dear FFTW users,

The official release of FFTW 3.2 is now available from the FFTW home page:


This release does *not* contain the experimental MPI transfroms from FFTW
3.2alpha; as those routines are still in alpha, they have been moved to 
3.3alpha1 (also available from the FFTW web page).

Compared to version 3.1.3 of FFTW, highlights of the FFTW 3.2 release 

* Significantly faster r2c/c2r transforms, especially on machines
   (e.g. x86) with SIMD instruction.

* Performance improvements for sizes with factors of 5 and 10.

* Rewritten threading support for improved performance.

* Support for the Cell processor, donated by IBM Research; see
   README.Cell and the Cell section of the manual.

* Support for MIPS paired-single SIMD instructions, donated by

The complete release notes can be found in the NEWS and ChangeLog files 
of the
release, and at:


Specific changes compared to FFTW 3.2alpha3 are listed below.

Steven G. Johnson and Matteo Frigo

FFTW 3.2 changes from 3.2alpha3

* Worked around apparent glibc bug that leads to rare hangs when freeing

* Fixed segfault due to unaligned access in certain obscure problems
   that use SSE and multiple threads.

* MPI transforms not included, as they are still in alpha; the alpha
   versions of the MPI transforms have been moved to FFTW 3.3alpha1.

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FFTW-announce at fftw.org

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