test(replay): optimize runtime performance#62
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bmwill merged 2 commits intobmwill:masterfrom Apr 13, 2026
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So we use stdout pipe to avoid thousands of forc-exec over `git ls-tree` and `git show`. Benchmark result for Apple M1 Pro (10 cores): | Repo | Before | After | Speedup | |-----------------------|-------:|-------:|--------:| | bmwill/diffy (full) | 31.76s | 11.06s | 2.9× | | rust-lang/cargo (200) | 93.04s | 14.60s | 6.4× |
Reduces subprocess count from 3 to 2 per commit pair. Benchmark result for full history replay (on 96-cores Linux host): | Repo | master | this | Speedup | |-----------------|----------|---------|---------| | rust-lang/cargo | 59.40s | 5.61s | 10.6× | | rust-lang/rust | 1682.06s | 101.66s | 16.5× | | python/cpython | 439.20s | 106.31s | 4.1× | On macOS M1 10 cores mahchine: | Repo | master | this | Speedup | |-----------------------|-------:|-------:|--------:| | bmwill/diffy (full) | 34.01s | 8.91s | 3.8× | | rust-lang/cargo (200) | 96.22s | 11.58s | 8.3× |
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git ls-treeandgit show.--rawand--numstatinto single git callBenchmark result for full history replay (on 96-cores Linux host):
On macOS M1 10 cores mahchine: