[SciPy-user] clapack and cblas modules are empty

[Ryan Krauss]

I think I have this exact situation and don't understand the final
answer.  Do I need to be concerned with the warning that my clapack
and cblas modules are empty?

ryan at ubuntu:~$ ldd /usr/lib/python2.4/site-packages/numpy/linalg/lapack_lite.so
        linux-gate.so.1 =>  (0xffffe000)
        liblapack.so.3 => /usr/lib/atlas/sse2/liblapack.so.3 (0xb7945000)
        libblas.so.3 => /usr/lib/atlas/sse2/libblas.so.3 (0xb73a8000)
        libg2c.so.0 => /usr/lib/libg2c.so.0 (0xb7381000)
        libm.so.6 => /lib/tls/i686/cmov/libm.so.6 (0xb735f000)
        libgcc_s.so.1 => /lib/libgcc_s.so.1 (0xb7355000)
        libc.so.6 => /lib/tls/i686/cmov/libc.so.6 (0xb7226000)
        /lib/ld-linux.so.2 (0x80000000)

ryan at ubuntu:~$ locate *clapack.so
/usr/lib/python2.4/site-packages/scipy/lib/lapack/clapack.so
/usr/lib/python2.4/site-packages/scipy/linalg/clapack.so

ryan at ubuntu:/usr/lib/python2.4/site-packages/scipy/lib/lapack$ ls -al
total 704
drwxr-xr-x 3 root root   4096 2007-03-16 09:50 .
drwxr-xr-x 4 root root   4096 2007-03-16 09:50 ..
-rwxr-xr-x 1 root root  13022 2007-03-16 09:49 atlas_version.so
-rwxr-xr-x 1 root root 103466 2007-03-16 09:49 calc_lwork.so
-rwxr-xr-x 1 root root  48398 2007-03-16 09:49 clapack.so
-rwxr-xr-x 1 root root 494047 2007-03-16 09:49 flapack.so
.
.
.


What does it all mean?

Thanks,

Ryan



On 12/1/06, Robert Kern <robert.kern at gmail.com> wrote:
> jrpirone wrote:
> > Hello,
> >
> > I've installed scipy and numpy from Andrew Straw's repository, all other
> > libraries are from the standard Ubuntu repositories (6.10).  When I
> > execute scipy.test(), the following warnings appear:
> >
> > ****************************************************************
> > WARNING: clapack module is empty
> > -----------
> > See scipy/INSTALL.txt for troubleshooting.
> > Notes:
> > * If atlas library is not found by numpy/distutils/system_info.py,
> >   then scipy uses flapack instead of clapack.
> > ****************************************************************
> >
> > ****************************************************************
> > WARNING: cblas module is empty
> > -----------
> > See scipy/INSTALL.txt for troubleshooting.
> > Notes:
> > * If atlas library is not found by numpy/distutils/system_info.py,
> >   then scipy uses fblas instead of cblas.
> > ****************************************************************
> >
> > Running the command:
> > ldd /usr/lib/python2.4/site-packages/numpy/linalg/lapack_lite.so
> >
> > Gives me:
> >         linux-gate.so.1 =>  (0xffffe000)
> >         liblapack.so.3 => /usr/lib/atlas/sse2/liblapack.so.3
> > (0xb7958000)
> >         libblas.so.3 => /usr/lib/atlas/sse2/libblas.so.3 (0xb7387000)
> >         libg2c.so.0 => /usr/lib/libg2c.so.0 (0xb735f000)
> >         libm.so.6 => /lib/tls/i686/cmov/libm.so.6 (0xb7339000)
> >         libgcc_s.so.1 => /lib/libgcc_s.so.1 (0xb732e000)
> >         libc.so.6 => /lib/tls/i686/cmov/libc.so.6 (0xb71fa000)
> >         /lib/ld-linux.so.2 (0x80000000)
> >
> > Is there a problem with the libraries I have installed?  Should I be
> > worried about these warnings, or am I just being compulsive?
>
> They're not *necessary* but they are nice to have. It demonstrates that scipy
> was not compiled with ATLAS.
>
> --
> Robert Kern
>
> "I have come to believe that the whole world is an enigma, a harmless enigma
>  that is made terrible by our own mad attempt to interpret it as though it had
>  an underlying truth."
>   -- Umberto Eco
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