Detect AVX2

[alimanfoo]

This PR modifies setup.py to detect support for AVX2 via the cpuinfo module.

Resolves #4.

cc @FrancescAlted this looks like it works, maybe useful for bcolz and python-blosc too.

[FrancescAlted]

Cool. Although provided that you cannot currently pass a better optimization level larger than -O1 in Python extensions, I am -0 in porting this back to bcolz or python-blosc. I think it is much better that people start using the C-Blosc library directly as stated in:

https://github.com/Blosc/python-blosc#compiling-with-an-installed-blosc-library-recommended

[alimanfoo]

Fair enough. It is strange but I am not seeing any segfaults with zarr, so
I have not limited the compiler optimisation level in setup.py. I haven't
used heavily yet tho so the same issue may still be there.

On Thursday, 14 April 2016, FrancescAlted notifications@github.com wrote:

Cool. Although provided that you cannot currently pass a better
optimization level larger than -O1 in Python extensions
Blosc/python-blosc#110, I am -0 in porting
this back to bcolz or python-blosc. I think it is much better that people
start using the C-Blosc library directly as stated in:

https://github.com/Blosc/python-blosc#compiling-with-an-installed-blosc-library-recommended

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Alistair Miles
Head of Epidemiological Informatics
Centre for Genomics and Global Health http://cggh.org
The Wellcome Trust Centre for Human Genetics
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[FrancescAlted]

No more segfaults? Hmmm, strange... I think they will come again, but I think it is nice that you enable -O2 or higher in zarr just to keep track of this.

[alimanfoo]

FWIW I have never seen segfaults with zarr, only bcolz. The previous
version of zarr only used the blosc contextual functions. The next zarr
release which I'm just preparing will have the option to use either the
contextual functions or the non-contextual functions like bcolz, so
something may come up. I'll try to run some heavier tests and see what
happens.

On Thursday, 14 April 2016, FrancescAlted notifications@github.com wrote:

No more segfaults? Hmmm, strange... I think they will come again, but I
think it is nice that you enable -O2 or higher in zarr just to keep track
of this.

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Alistair Miles
Head of Epidemiological Informatics
Centre for Genomics and Global Health http://cggh.org
The Wellcome Trust Centre for Human Genetics
Roosevelt Drive
Oxford
OX3 7BN
United Kingdom
Email: alimanfoo@googlemail.com alimanfoo@gmail.com
Web: http://purl.org/net/aliman
Twitter: https://twitter.com/alimanfoo
Tel: +44 (0)1865 287721