[SciPy-dev] building lib.lapack without optimization
Pearu Peterson
pearu at scipy.org
Tue Nov 30 07:47:28 EST 2004
On Tue, 30 Nov 2004, Nils Wagner wrote:
> Here are my findings...
>
> python2.3 setup_lapack.py build config_fc --noarch --opt="-O2" yields
>
> ======================================================================
> FAIL: check_heev_complex (__main__.test_clapack_complex)
> ----------------------------------------------------------------------
> Traceback (most recent call last):
> File "tests/test_lapack.py", line 51, in check_heev_complex
> assert_array_almost_equal(dot(a,v[:,i]),w[i]*v[:,i])
> File "/usr/lib/python2.3/site-packages/scipy_test/testing.py", line 748, in
> assert_array_almost_equal
> assert cond,\
> AssertionError:
> Arrays are not almost equal (mismatch 33.3333333333%):
> Array 1: [-1.2905481 -4.3758251e+00j -2.0410486 +1.3645462e+00j
> 3.5935487 +2.8312206e-07j]
> Array 2: [-1.2905486-4.3758267j -2.041049 +1.3645459j 3.5935484-0.j
> ]
>
>
> ======================================================================
> FAIL: check_heev_complex (__main__.test_flapack_complex)
> ----------------------------------------------------------------------
> Traceback (most recent call last):
> File "tests/test_lapack.py", line 51, in check_heev_complex
> assert_array_almost_equal(dot(a,v[:,i]),w[i]*v[:,i])
> File "/usr/lib/python2.3/site-packages/scipy_test/testing.py", line 748, in
> assert_array_almost_equal
> assert cond,\
> AssertionError:
> Arrays are not almost equal (mismatch 33.3333333333%):
> Array 1: [-1.2905481 -4.3758251e+00j -2.0410486 +1.3645462e+00j
> 3.5935487 +2.8312206e-07j]
> Array 2: [-1.2905486-4.3758267j -2.041049 +1.3645459j 3.5935484-0.j
> ]
So, -O2 fixes the problem. I'll make it default for gcc-3.3.3 compiler.
Also, if your lapack libraries are built with -O3 then rebuilding them
with -O2 should fix the segmentation faults.
> So any optimization fails.
Note that in the failures the results are actually correct. Just the
corresponding tests need some tuning.. So, I am not considering them as
failures.
>>>> What gcc version are you using?
>>> gcc version 3.3.3 (SuSE Linux)
>> Btw, I am using gcc 3.3.5 (Debian Sid) with no problems.
>>
> SuSE 9.2 comes with gcc 3.3.4.
> Do you have any experience with that version ?
I don't remember.
Pearu
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