[Numpy-discussion] speed of numpy vs matlab on dot product

Charles R Harris charlesr.harris at gmail.com
Sat Jun 10 23:47:28 CDT 2006


I just tried this and it took so long on my machine (Athlon64, fc5_x86_64),
that I ctrl-c'd out of it. Running ldd on lapack_lite.so shows

        libpthread.so.0 => /lib64/libpthread.so.0 (0x00002aaaaace2000)
        libc.so.6 => /lib64/libc.so.6 (0x00002aaaaadfa000)
        /lib64/ld-linux-x86-64.so.2 (0x0000555555554000)

So apparently the Atlas library present in /usr/lib64/atlas was not linked
in. I built numpy from the svn repository two days ago. I expect JJ's
version is linked with atlas 'cause mine sure didn't run in 11 seconds.


On 6/10/06, Robert Kern <robert.kern at gmail.com> wrote:
> JJ wrote:
> > Any ideas on where to look for a speedup?  If the
> > problem is that it could not locate the atlas
> > ibraries, how might I assure that numpy finds the
> > atlas libraries.  I can recompile and send along the
> > results if it would help.
> Run ldd(1) on the file lapack_lite.so . It should show you what dynamic
> libraries it is linked against.
> > PS.  I first sent this to the scipy mailing list, but
> > it didnt seem to make it there.
> That's okay. This is actually the right place. All of the functions you
> used are
> numpy functions, not scipy.
> --
> 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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