Re: [eigen] Re: Eigen beta test errors

[Benoit Jacob <jacob.benoit.1@xxxxxxxxx>]

Then can you add a little unit test for this bug? When you have time :)

(Sorry to give you work :) )

Benoit

2010/7/5 Gael Guennebaud <gael.guennebaud@xxxxxxxxx>:
> I still don't understand why it worked on other platforms....
>
> gael
>
> On Mon, Jul 5, 2010 at 3:40 PM, Benoit Jacob <jacob.benoit.1@xxxxxxxxx> wrote:
>> What was the error? Was it really 32bit specific or was it something
>> that  a suitable unit test could detect on other platforms?
>>
>> Benoit
>>
>> 2010/7/5 Gael Guennebaud <gael.guennebaud@xxxxxxxxx>:
>>> product_syrk_1 is fixed.
>>>
>>> I can also reproduce packetmath_1 by running it a very large number of
>>> times, but there is nothing critical here... it fails on stuff like:
>>> 0.00128718 is not approx to 0.00128716.... so that's fine.
>>>
>>> Same for SVD.
>>>
>>> It is "normal" that some tests randomly fail. Well, these tests should
>>> be fixed, but the problem is not in Eigen itself.
>>>
>>> gael
>>>
>>> On Mon, Jul 5, 2010 at 6:07 AM, Benoit Jacob <jacob.benoit.1@xxxxxxxxx> wrote:
>>>> On linux x86-64 with gcc 4.4.4, I can't reproduce any of these issues.
>>>>
>>>> So they are probably 32bit-specific. Can anybody try these tests on
>>>> linux x86-32 and confirm? I don't have multilib working (one of many
>>>> fedora annoyances) so I can't try.
>>>>
>>>> I tried -mfpmath=387 and that didn't make any difference: I still
>>>> couldn't reproduce the failures.
>>>>
>>>> Can you also check that you are testing the latest revision from hg
>>>> (hg diff should say nothing and hg parent should return the latest
>>>> revision).
>>>>
>>>> Benoit
>>>>
>>>> 2010/7/4 Carlos Becker <carlosbecker@xxxxxxxxx>:
>>>>> I could now reproduce the error in packetmath_1:
>>>>> a[3]: 0.00128718, b[3]: 0.00128716
>>>>> Test packetmath<float>() failed in "/home/cjb/eigenThings
>>>>>     areApprox(ref, data2, PacketSize) && "ei_preduxp"
>>>>> and in svd_1 after some trials:
>>>>> Test svd(Matrix3f()) failed in "/home/cjb/eigenThings/eigen/test/svd.cpp"
>>>>> (63)
>>>>>     test_ei_isApprox(a * x, b)
>>>>> but I still have to get the right values.
>>>>> The most important error is in product_syrk_1, where I just get a segfault
>>>>> :S, anyone getting the same behaviour?
>>>>>
>>>>> On Sun, Jul 4, 2010 at 10:47 PM, Carlos Becker <carlosbecker@xxxxxxxxx>
>>>>> wrote:
>>>>>>
>>>>>> Hi everyone, these are the errors I get with OpenMP enabled, vectorization
>>>>>> enabled (up to SSE3) and row major alignment. GCC v4.4.1, ubuntu x32
>>>>>>
>>>>>> 99% tests passed, 4 tests failed out of 452
>>>>>>
>>>>>> The following tests FAILED:
>>>>>>       14 - packetmath_1 (Failed)
>>>>>>      194 - product_syrk_1 (Failed)
>>>>>>      214 - stable_norm_1 (Failed)
>>>>>>      319 - svd_1 (Failed)
>>>>>> Errors while running CTest
>>>>>>
>>>>>> However, I ran it a second time and only stable_norm_1 and product_syrk_1
>>>>>> failed! Now, ran it a third time and got these two failing again PLUS
>>>>>> redux_8 !!! I really don't know what is happening, and I tried running
>>>>>> packetmath_1 several times on my own and could not make it fail. The same
>>>>>> happened with svd_1.
>>>>>>
>>>>>> However, I can make redux_8 fail: Test vectorRedux(ArrayXf(33)) failed in
>>>>>> "/home/cjb/eigenThings/eigen/test/redux.cpp" (88)
>>>>>>     test_ei_isApprox(s, v.head(i).sum())
>>>>>>
>>>>>> and printing some values:  s : 0.000287235, v.head(i).sum(): 0.000286877,
>>>>>> although I don't know if this makes sense really.
>>>>>>
>>>>>> Does this all make sense somehow? I am starting to believe that something
>>>>>> is wrong with my processor, or I am a very special case.
>>>>>>
>>>>>> Carlos
>>>>>
>>>>
>>>>
>>>>
>>>
>>>
>>>
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