| commit | cd26ceeab1fbd0b841b083cba179ac516908cf65 | [log] [tgz] |
|---|---|---|
| author | Jens Johansen <jensj@google.com> | Wed Nov 08 11:03:54 2023 +0000 |
| committer | Commit Queue <dart-scoped@luci-project-accounts.iam.gserviceaccount.com> | Wed Nov 08 11:03:54 2023 +0000 |
| tree | fc7bb54981fd671dc9c8afcbb8c8897ff7c9e054 | |
| parent | 1820bae91518da1628fe4a195623be97143bcbb0 [diff] |
[CFE] Micro-optimizations shaves off 1.42% With a aot snapshot generated before this CL like this: ``` out/ReleaseX64/dart-sdk/bin/dart compile aot-snapshot \ pkg/front_end/tool/_fasta/compile.dart ``` and then moved to `pkg/front_end/tool/_fasta/compile.org`, then benchmarks run like ``` rm /path/to/other/checkout/pkg/front_end/tool/_fasta/compile.dart.dill ; \ rm pkg/front_end/tool/_fasta/compile.aot ; \ out/ReleaseX64/dart-sdk/bin/dart compile aot-snapshot \ pkg/front_end/tool/_fasta/compile.dart && \ out/ReleaseX64/dart pkg/front_end/tool/benchmarker.dart \ --iterations=50 \ --snapshot=pkg/front_end/tool/_fasta/compile.org \ --snapshot=pkg/front_end/tool/_fasta/compile.aot \ --arguments=/path/to/other/checkout/pkg/front_end/tool/_fasta/compile.dart \ --filesize=/path/to/other/checkout/pkg/front_end/tool/_fasta/compile.dart.dill ``` (The other checkout is at 8b01baab714cb6462a5172a9ba0d19ac7fbcae1f) I get this: ``` Generated: [...]/pkg/front_end/tool/_fasta/compile.aot Will now run 50 iterations with 2 snapshots. ...................................................................................................... Comparing snapshot 1 with snapshot 2 msec task-clock:u: -1.9077% +/- 0.5801% (-74.85 +/- 22.76) page-faults:u: -2.6477% +/- 0.0391% (-2579.42 +/- 38.12) cycles:u: -2.0459% +/- 0.6018% (-324680453.54 +/- 95498561.25) instructions:u: -1.4202% +/- 0.0003% (-286466291.62 +/- 55229.41) branch-misses:u: -3.0746% +/- 2.3469% (-1904933.80 +/- 1454106.83) seconds time elapsed: -1.9144% +/- 0.5791% (-0.08 +/- 0.02) seconds user: -1.8955% +/- 0.6479% (-0.07 +/- 0.02) Scavenge( new space) goes from 56 to 55 Notice combined GC time goes from 948 ms to 925 ms (notice only 1 run each). ``` So `instructions:u` being the most stable says a reduction of 1.42%, time is in that range too (-1.9077% +/- 0.5801%), although in both cases some of it is likely the number of new space GCs going from 56 to 55. Change-Id: I0422af966f1902c50caa366cc2ad2cd7553c06d4 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/333501 Commit-Queue: Jens Johansen <jensj@google.com> Reviewed-by: Johnni Winther <johnniwinther@google.com>
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