[Cython] Hudson pyregr testing takes too long

[Stefan Behnel]

Vitja Makarov, 25.04.2011 08:19:
> 2011/4/25 Stefan Behnel:
>> Stefan Behnel, 07.04.2011 13:52:
>>>
>>> Stefan Behnel, 07.04.2011 13:46:
>>>>
>>>> I just noticed that the CPython pyregr tests have jumped up from ~14
>>>> minutes for a run to ~4 hours when we added generator support.
>>>>
>>>>
>>>> https://sage.math.washington.edu:8091/hudson/job/cython-devel-tests-pyregr-py26-c/buildTimeTrend
>>>>
>>>> I currently have no idea why that is (well, it's likely because we
>>>> compile
>>>> more tests now, but Vitja's branch ran the tests in ~30 minutes). It
>>>> would
>>>> be great if someone could find the time to analyse this problem. The
>>>> current run time makes it basically impossible to keep these tests
>>>> enabled.
>>>
>>> Ok, it looks like this is mostly an issue with the Py2.6 tests. The Py2.7
>>> tests take 30-45 minutes, which is very long, but not completely out of
>>> bounds. I've disabled the Py2.6 pyregr tests for now.
>>
>> There seems to be a huge memory leak which almost certainly accounts for
>> this. The Python process that runs the pyregr suite ends up with about 50GB
>> of memory at the end, also in the latest Py3k builds.
>>
>> I have no idea where it may be, but it started to show when we merged the
>> generator support. That's where I noticed the instant jump in the runtime.
>
> That's very strange for my branch it takes about 30 minutes that is ok.

There's also a second path that's worth investigating. As part of the 
merge, there was another change that came in: the CythonPyregrTestCase 
implementation. This means that the regression tests are now being run 
differently than before. The massive memory consumption may simply be due 
to the mass of unit tests being loaded into memory.

Stefan