[Numpy-discussion] eig hangs (original) (raw)

Robert Hetland hetland at tamu.edu
Mon Jun 12 19:03:36 EDT 2006

On Jun 12, 2006, at 3:17 PM, Travis Oliphant wrote:

Robert Hetland wrote:

I set up a linux machine without BLAS, LAPACK, ATLAS, hoping that lapacklite would take over. For the moment, I am not concerned about speed -- I just want something that will work with small matricies. I installed numpy, and it passes all of the tests OK, but it hangs when doing eig:

u, v = linalg.eig(rand(10,10)) # ....lots of nothing.... Do you need the linear algebra libraries for eig? BTW, inverse seems to work fine. -Rob From ticket #5 Greg Landrum pointed out that it may be a gcc 4.0 related problem and proposed a workaround -- to add the option '-ffloat- store' to CFLAGS. Works for me ! Are you using gcc 4.0?

Well, gcc 4.1, I had forgotten to check that. The install is on a
relatively new version of Fedora, FC5. (all the older redhats I have
use gcc3..).

$ uname -a Linux ---.----.--- 2.6.15-1.2054_FC5smp #1 SMP Tue Mar 14 16:05:46
EST 2006 i686 i686 i386 GNU/Linux

$ gcc --version gcc (GCC) 4.1.0 20060304 (Red Hat 4.1.0-3)

That seems like the most likely cause of the bug. I will try with - ffloat-store, and with gcc 3.2.3, and let you know if I have the same
problems.

-Rob.

Rob Hetland, Assistant Professor Dept of Oceanography, Texas A&M University p: 979-458-0096, f: 979-845-6331 e: hetland at tamu.edu, w: http://pong.tamu.edu

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