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Splits eval-test into simple buckets by first letter of test name, enabling
parallel execution. This speeds up execution of the test suite by around 25% on
my laptop. The split enables more consistent loading of all CPU cores during
the entire run of ./runtests.py.
To achieve this, I had to modify testpythoneval.py to not write all testcase
inputs to the same temporary path.
Before:
After:
Total wall clock time fell from 5:48 to 4:23.
Note: the test sum is now over-reported. Looks like the driver counts also the
filtered out tests in eval-test. I don't have cycles now to hunt this down.