Auto merge of #159149 - Kobzol:bootstrap-pgo-cargo, r=jieyouxu Use PGO for Cargo I downloaded the built Cargo and compared it with the parent commit locally on `bors` (which is of course not in the PGO training set). The results are quite nice: ``` Benchmark 1 (26 runs): cargo +babf6ea4aab9ed78ea9400b25b0e7e79a6870f29 test --no-run measurement mean ± σ min … max outliers delta wall_time 192ms ± 6.95ms 188ms … 226ms 1 ( 4%) 0% peak_rss 96.3MB ± 354KB 95.6MB … 96.9MB 0 ( 0%) 0% cpu_cycles 454M ± 5.92M 448M … 480M 1 ( 4%) 0% instructions 797M ± 5.68M 796M … 825M 1 ( 4%) 0% cache_references 32.7M ± 352K 32.0M … 34.0M 1 ( 4%) 0% cache_misses 8.82M ± 86.9K 8.67M … 9.10M 1 ( 4%) 0% branch_misses 3.76M ± 41.3K 3.72M … 3.93M 1 ( 4%) 0% Benchmark 2 (28 runs): cargo +b2aa8c0474895b96828df9c09182952caf6f6450 test --no-run measurement mean ± σ min … max outliers delta wall_time 185ms ± 7.07ms 175ms … 208ms 1 ( 4%) ⚡- 3.9% ± 2.0% peak_rss 90.9MB ± 207KB 90.4MB … 91.3MB 1 ( 4%) ⚡- 5.6% ± 0.2% cpu_cycles 420M ± 9.31M 406M … 440M 0 ( 0%) ⚡- 7.7% ± 0.9% instructions 736M ± 5.47M 735M … 764M 1 ( 4%) ⚡- 7.6% ± 0.4% cache_references 26.2M ± 406K 25.7M … 28.0M 2 ( 7%) ⚡- 19.9% ± 0.6% cache_misses 6.01M ± 92.7K 5.85M … 6.28M 1 ( 4%) ⚡- 31.8% ± 0.6% branch_misses 3.47M ± 55.9K 3.40M … 3.69M 1 ( 4%) ⚡- 7.6% ± 0.7% ``` ~7.5% icount improvement, that's pretty cool.
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