Explicit PyPy Support (in progress)

[jamadden]

ZODB currently does not cleanly pass a test run under PyPy --- there are numerous failures.

Part of this is due to the lack of noload in PyPy's "cPickle" module (which is actually implemented in Python) --- this is easily solved through the use of zodbpickle (which is already a dependency). At least part of the rest of it is due to differences in the C and pure-Python implementations of persistent (e.g., the Python PickleCache lacks some size attributes found in the C version).

Hopefully the rest are minor differences, but I'm not sure yet. I'm working on a branch at https://github.com/NextThought/ZODB/tree/pypy to find out, and hopefully fix them (looks like some other PRs in persistent will be useful, too).

I'm opening this issue to let people know someone is working on this, and maybe to have a place to ask for help if I get stuck :)

[jamadden]

As of now, the ZODB code in this ZODB branch together with the persistent code in this branch runs all 930 unit tests. The modifications to ZODB are very minimal, most of the changes are in persistent.

The functional tests still have some issues. I'm guessing those are mostly refcounting/GC related. I'll look into those next.

[jamadden]

Update: All 482 functional tests now run under PyPy using those branches.

[jamadden]

With the ZODB code in this branch and the persistent code in this branch, the version of ZEO in this branch passes all of its unit and functional tests. I'll start opening PRs for ZODB and ZEO as soon as persistent gets merged.

[gotcha]

@jamadden branch of persistent has been merged and released as 4.0.9

[jamadden]

@gotcha We are waiting on zopefoundation/persistent#20 to be merged and released as 4.0.10.

[tseaver]

I've just doint a review of zopefoundation/persistent#20

[jamadden]

@tseaver Thank you! I know there's a lot to review there. The PRs for ZODB and ZEO are (currently) much smaller.

[tseaver]

I don't see a PR for ZEO.

[tseaver]

Actually, I don't see one for ZODB, either: are both pending landing zopefoundation/persistent#20?

[jamadden]

Yes. I could open them now, but they would fail all the Travis tests until that PR gets merged and released. I should have been more specific about the "forthcoming PRs".