zodb / relstorage / 797

91%

master: 92%

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travis-ci

Refactor the interfaces and layers so the responsibilities make more sense.

This also allows for a more fair test of the (unoptimized, incomplete) SQL-based storage.

Performance numbers below; what they don't show is the memory usage. The CFFI ring takes between 80 and 215MB to do what the temp SQL storage does in about 2MB.

+-----------+----------+--------------------------------+
| Benchmark | CFFI_100 | SQL_100                        |
+===========+==========+================================+
| pop_eq    | 1.04 sec | 3.13 sec: 3.00x slower (+200%) |
+-----------+----------+--------------------------------+
| pop_ne    | 1.11 sec | 3.66 sec: 3.29x slower (+229%) |
+-----------+----------+--------------------------------+
| epop      | 947 ms   | 2.62 sec: 2.77x slower (+177%) |
+-----------+----------+--------------------------------+
| read      | 370 ms   | 1.14 sec: 3.09x slower (+209%) |
+-----------+----------+--------------------------------+
| mix       | 1.32 sec | 4.23 sec: 3.20x slower (+220%) |
+-----------+----------+--------------------------------+

132 of 132 new or added lines in 9 files covered. (100.0%)

10396 of 11435 relevant lines covered (90.91%)

3.61 hits per line