Hi All, I prepared a (very preliminary) source package for Automatically Tuned Linear Algebra Software (ATLAS). It is a fast alternative to the reference BLAS/LAPACK build. ATLAS 3.9.16 packages, source and Core232SSE3 lib, for cygwin-1.7 are at http://matzeri.altervista.org/cygwin-1.7/atlas/index.html
The source package should allow to build any other specific core version, if not please let me know. Of course you need cygport ;-) and gcc-4 + gfortran The SciViews bechmark http://www.sciviews.org/benchmark/index.html was used to compare the blas/lapack reference with Atlas one, and the outcome is: ================================================================ Lapack 3.2.1 vs Atlas-3.9.16 with Core232SSE3 on Cygwin-1.7 I. Matrix calculation --------------------- 700x700 cross-product matrix (b = a' * a)___________ (sec): 0.3564 0.0653 Linear regression over a 600x600 matrix (c = a \\ b')(sec): 0.1269 0.0554 II. Matrix functions -------------------- Determinant of a 650x650 random matrix______________ (sec): 0.1586 0.0643 Cholesky decomposition of a 900x900 matrix__________ (sec): 0.2319 0.0686 Inverse of a 400x400 random matrix__________________ (sec): 0.1030 0.0455 ================================================================= So at least a factor 2 up to a factor 6 improvement. I am very interested to receive feedback on the source package and the performance comparison for the various core. At the end of the build the lib package is called libatlas0_RenameWithCore-3.9.16-1.tar.bz2 and it contains the dll's $ tar -tjf libatlas0_RenameWithCore-3.9.16-1.tar.bz2 usr/bin/ usr/bin/cygatlas-0.dll usr/bin/cygblas-0.dll usr/bin/cygclapack-0.dll usr/bin/cyglapack-0.dll that you can copy on /usr/bin or on usr/local/bin as you prefer The lapack dll are behind in the path $ cygcheck -l liblapack0 /etc/profile.d/lapack0.csh /etc/profile.d/lapack0.sh /usr/lib/lapack/cygblas-0.dll /usr/lib/lapack/cyglapack-0.dll so they will be overcome, without being removed. Regards Marco Atzeri cygwin package mantainer for lapack -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
