[Numpy-discussion] Numpy.dot segmentation fault

Mark Lescroart lescroar@usc....
Mon Jan 18 19:15:00 CST 2010


Hi David (et al),

Thanks for the reply. The version of ATLAS I was using was v3.8.3_1,  
installed via MacPorts, compiled and built on my machine with a gcc4.3  
compiler. I uninstalled numpy 1.4 and ATLAS, re-installed (i.e., re- 
compiled) the same version (3.8.3_1), re-installed numpy (for  
python2.6, version 1.4), and got the same bug.

I don't know if this means that there's something fundamentally wrong  
with the version of ATLAS on MacPorts (probably less likely) or  
something wrong with the way my system is configured (probably more  
likely). If anyone can give me any more insight into how to test my  
installation of ATLAS, I would be much obliged (I read through a fair  
bit of the ATLAS installation notes on the ATLAS sourceforge page, and  
could not figure out how to "run the whole test suite" ).

If possible, I would like to solve this problem within Macports (and  
thus not with the Accelerate framework). I am using numpy mostly  
through the pyMVPA package for fMRI multi-voxel analysis, and the  
pyMVPA package depends on a number of other libraries, and the mess of  
dependencies is most easily managed within the framework of Macports.

Cheers,

Mark

On Jan 17, 2010, at 8:38 PM, David Cournapeau wrote:

> Mark Lescroart wrote:
>> Hello,
>>
>> I've encountered a segfault in numpy when trying to compute a dot
>> product for two arrays - see code below. The problem only seems to  
>> occur
>> when the arrays reach a certain size.
>
> Your atlas is most likely broken. You will have to double-check how  
> you
> built it, and maybe run the whole test suite (as indicated in the  
> ATLAS
> installation notes).
>
> Note that you can use the Accelerate framework on mac os x, this is  
> much
> easier to get numpy working on mac,
>
> cheers,
>
> David
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