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Very large test suites take *far* too much RAM #619

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Originally reported by: Alex Gaynor (BitBucket: alex_gaynor, GitHub: alex_gaynor)


The cryptography test suite on OS X -- which is 149150 test functions (almost entirely generated with @pytest.mark.parametrize) -- results in a CPython 2.7 process which, after collection, takes 1.26GB or so.

This is about 8KB per test. This seems like way too much, it would be fantastic to bring this significantly down.


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    status: help wanteddevelopers would like help from experts on this topictype: performanceperformance or memory problem/improvement

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