[Numpy-discussion] ATLAS problems

[Justin Bedo]

Hi All,

I'm trying to compile NumPy using the ATLAS libraries but am having
some difficulty with it.  I've managed to build numpy such that
lapack_lite.so is linked as follows:

        linux-gate.so.1 =>  (0xffffe000)
        libatlas.so => /usr/local/atlas/lib/libatlas.so (0xb79e9000)
        libptcblas.so => /usr/local/atlas/lib/libptcblas.so (0xb79c7000)
        libptf77blas.so => /usr/local/atlas/lib/libptf77blas.so (0xb79ac000)
        libpython2.5.so.1.0 => /usr/lib/libpython2.5.so.1.0 (0xb788f000)
        libgfortran.so.1 => /usr/lib/libgfortran.so.1 (0xb7817000)
        libm.so.6 => /lib/libm.so.6 (0xb77f1000)
        libgcc_s.so.1 => /lib/libgcc_s.so.1 (0xb77e5000)
        libc.so.6 => /lib/libc.so.6 (0xb76b7000)
        libpthread.so.0 => /lib/libpthread.so.0 (0xb769f000)
        libdl.so.2 => /lib/libdl.so.2 (0xb769a000)
        libutil.so.1 => /lib/libutil.so.1 (0xb7696000)
        /lib/ld-linux.so.2 (0x80000000)

However despite this, the performance when multiplying matrices is
extremely slow, and only a single thread is used even though
lapack_lite.so is linked with the pt atlas libraries.  Does anybody
know how to fix this problem?

Thanks
Justin