Add runtime environment check for NERSC Cray hugepages

[lgarrison]

As discussed in #244 and #245. The runtime check is called from __init__.py, which avoids having to put the check inside each Python module.

I tested this at NERSC and it works as expected, with and without the hugepages module loaded.

[pep8speaks]

Hello @lgarrison! Thanks for updating this PR. We checked the lines you've touched for PEP 8 issues, and found:

There are currently no PEP 8 issues detected in this Pull Request. Cheers! :beers:

Comment last updated at 2021-04-15 21:54:32 UTC

[lgarrison]

@manodeep Looks like some unrelated build failures, any idea what changed?

[manodeep]

Ahh yes - GH replaced their default pre-installed tools and some combinations of OS + compiler now fail. They apparently update the list of tools ~weekly, with the latest list of tools listed here. From what I can see:

• 16.04 has gcc-5, gcc-9, clang-9
• 18.04 has gcc-7, gcc-9, gcc-10, clang-9
• 20.04 has gcc-9, gcc-10, clang-9, clang-10, clang-11
• macos-latest (10.15) has gcc-8, gcc-9, gcc-10 (through brew), clang-12 (default clang), clang-11

Are you okay to fix these build failures?

[manodeep]

@lgarrison Should the astropy-bot have run on this PR?

[lgarrison]

Yeah, no sign of Astropy bot yet. Thanks for linking the docs, I should be good to fix the failures, fingers crossed!

[lgarrison]

@manodeep Tests are passing, okay to merge?

[manodeep]

Yup - done now :)

Do you want to delete the branch?