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1. Running totals for the status line. print_stats recounted every mutant's verdict on every loop iteration, quadratic over a run and paid again on a rerun just to skip cached results. ProgressCounter computes the totals once and adjusts them per verdict. 2. Batched meta writes. Every finished mutant rewrote its whole .meta file. register_result now marks the file dirty; the loop flushes dirty files every two seconds and at the end, also on interrupt. A crash loses at most two seconds of verdicts, which are re-tested. 3. Precompiled tree. The single-process stats run compiled every generated file on first import. precompile_mutants byte-compiles the mutated source paths with a worker pool right after generation; up-to-date .pyc files are skipped.
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Running totals for the status line. print_stats recounted every mutant's verdict on every loop iteration, quadratic over a run and paid again on a rerun just to skip cached results. ProgressCounter computes the totals once and adjusts them per verdict.
Batched meta writes. Every finished mutant rewrote its whole .meta file. register_result now marks the file dirty; the loop flushes dirty files every two seconds and at the end, which can combine updates from multiple mutants. A SIGTERM will flush the last batch, but a crash loses at most two seconds of verdicts that the next run will have to re-compute.
Precompiled tree. The single-process stats run compiled every generated file on first import. precompile_mutants byte-compiles the mutated source paths with a worker pool right after generation; up-to-date .pyc files are skipped.