Package: libatlas3gf-base
Version: 3.8.3-25
Severity: important
Tags: patch
Hi Sylvestre,
I finally managed to get mulitthreaded Atlas working. I started from
Atlas 3.9.25, the newest and shiniest, and then tried to see what I
needed from our patch set to get shared libraries the way 'we' use
them on Debian -- so that I get the pluggability I use in the paper I
sent you a draft of.
The key is in 03_full_blas_lapack.diff
+# Build full netlib blas/lapack libraries:
+atlas/libblas.a: libatlas.a libf77blas.a libcblas.a
+ mkdir tmp
+ (cd tmp && ar x ../libatlas.a);
+ (cd tmp && ar x ../libf77blas.a);
+ (cd tmp && ar x ../libcblas.a);
+ ar r $@ tmp/*.o
+ rm -rf tmp
We extract the fully built object files from libf77blas.a and
libcblas.a. If instead you use
atlas/libblas.a: libatlas.a libf77blas.a libcblas.a
mkdir tmp
(cd tmp && ar x ../libatlas.a);
(cd tmp && ar x ../libptf77blas.a);
(cd tmp && ar x ../libptcblas.a);
ar r $@ tmp/*.o
rm -rf tmp
ie you employ the _parallel threaded_ versions that have also been
built then everything is good.
I have a basic (local) libatlas39 package in use here, and I can show
you results from an update of the paper that clearly show the manifold
increase in speed.
Now, maybe we need single-threaded and multi-threaded versions. Or
maybe you can switch based on a user variable? I leave that in your
capable maintainer hands.
Me, I am just happy that I have an Atlas version that is closing the
gap to Goto BLAS and the Intel MKL BLAS.
Cheers, Dirk
-- System Information:
Debian Release: squeeze/sid
APT prefers lucid-updates
APT policy: (500, 'lucid-updates'), (500, 'lucid-security'), (500, 'lucid')
Architecture: amd64 (x86_64)
Kernel: Linux 2.6.32-23-generic (SMP w/8 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Versions of packages libatlas3gf-base depends on:
ii libc6 2.11.1-0ubuntu7.2 Embedded GNU C Library: Shared lib
ii libgcc1 1:4.4.3-4ubuntu5 GCC support library
ii libgfortran3 4.4.3-4ubuntu5 Runtime library for GNU Fortran ap
libatlas3gf-base recommends no packages.
Versions of packages libatlas3gf-base suggests:
ii libblas3gf 1.2-7 Basic Linear Algebra Reference imp
ii liblapack3gf 3.2.2-1 library of linear algebra routines
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