[Numpy-discussion] Debian: numpy not building _dotblas.so

[Ondrej Certik]

On Tue, Jul 8, 2008 at 9:15 PM, Robert Kern <robert.kern at gmail.com> wrote:
> On Tue, Jul 8, 2008 at 08:06, Ondrej Certik <ondrej at certik.cz> wrote:
>> On Tue, Jul 8, 2008 at 11:48 AM, Tiziano Zito <opossumnano at gmail.com> wrote:
>>> Hi numpy-devs, I was the one reporting the original bug about missing ATLAS
>>> support in the debian lenny python-numpy package. AFAICT the source
>>> python-numpy package in etch (numpy version 1.0.1) does not require
>>> atlas to build
>>> _dotblas.c, only lapack is needed. If you install the resulting binary
>>> package on a
>>> system where ATLAS is present, ATLAS libraries are used instead of plain lapack.
>>> So basically it was already working before the check for ATLAS was
>>> introduced into
>>> the numpy building system. Why should ATLAS now be required?
>>>
>>>> It's not as trivial as just reverting that changeset, though.
>>> why is that? I mean, it was *working* before...
>>
>> So just removing the two lines from numpy seems to fix the problem in
>> Debian. So far all tests seem to run both on i386 and amd64, both with
>> and without atlas packages installed. And it is indeed faster with the
>> altas packages instaled, yet it doesn't need them to build. I think
>> that's what we want, no?
>
> Can you give me more details?

Sure. :)

> Was the binary built on a machine with
> an absent ATLAS?

Yes, the binary is always built on a machine with an absent atlas, as
the package is build-conflicting with atlas.

> Show me the output of ldd on _dotblas.so with both
> ATLAS installed and not. Can you import numpy.core._dotblas explicitly
> under both?

ATLAS installed:

ondra at fuji:~/debian$ ldd /usr/lib/python2.5/site-packages/numpy/core/_dotblas.so
        linux-gate.so.1 =>  (0xb7fba000)
	libblas.so.3gf => /usr/lib/atlas/libblas.so.3gf (0xb7c19000)
	libgfortran.so.3 => /usr/lib/libgfortran.so.3 (0xb7b67000)
	libm.so.6 => /lib/i686/cmov/libm.so.6 (0xb7b40000)
	libgcc_s.so.1 => /lib/libgcc_s.so.1 (0xb7b33000)
	libc.so.6 => /lib/i686/cmov/libc.so.6 (0xb79d8000)
	/lib/ld-linux.so.2 (0xb7fbb000)
ondra at fuji:~/debian$ python
Python 2.5.2 (r252:60911, Jun 25 2008, 17:58:32)
[GCC 4.3.1] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import numpy.core._dotblas
>>>


ATLAS not installed:

ondra at fuji:~/debian$ ldd /usr/lib/python2.5/site-packages/numpy/core/_dotblas.so
        linux-gate.so.1 =>  (0xb7f2f000)
	libblas.so.3gf => /usr/lib/libblas.so.3gf (0xb7e82000)
	libgfortran.so.3 => /usr/lib/libgfortran.so.3 (0xb7dd0000)
	libm.so.6 => /lib/i686/cmov/libm.so.6 (0xb7da9000)
	libgcc_s.so.1 => /lib/libgcc_s.so.1 (0xb7d9c000)
	libc.so.6 => /lib/i686/cmov/libc.so.6 (0xb7c41000)
	/lib/ld-linux.so.2 (0xb7f30000)
ondra at fuji:~/debian$ python
Python 2.5.2 (r252:60911, Jun 25 2008, 17:58:32)
[GCC 4.3.1] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import numpy.core._dotblas
>>>



Ondrej