[Numpy-discussion] speed of numpy vs matlab on dot product (original) (raw)

Charles R Harris charlesr.harris at gmail.com
Sun Jun 11 00:47:28 EDT 2006

Hmm,

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.

Chuck

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 lapacklite.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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