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## Pre-launch Checklist - [x] I read the [Contributor Guide] and followed the process outlined there for submitting PRs. - [x] I read the [Tree Hygiene] wiki page, which explains my responsibilities. - [x] I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement]. - [x] I signed the [CLA]. - [x] I listed at least one issue that this PR fixes in the description above. - [x] I updated/added relevant documentation (doc comments with `///`). - [x] I added new tests to check the change I am making, or this PR is [test-exempt]. - [x] I followed the [breaking change policy] and added [Data Driven Fixes] where supported. - [x] All existing and new tests are passing. If you need help, consider asking for advice on the #hackers-new channel on [Discord]. **Note**: The Flutter team is currently trialing the use of [Gemini Code Assist for GitHub](https://developers.google.com/gemini-code-assist/docs/review-github-code). Comments from the `gemini-code-assist` bot should not be taken as authoritative feedback from the Flutter team. If you find its comments useful you can update your code accordingly, but if you are unsure or disagree with the feedback, please feel free to wait for a Flutter team member's review for guidance on which automated comments should be addressed. <!-- Links --> [Contributor Guide]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#overview [Tree Hygiene]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md [test-exempt]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#tests [Flutter Style Guide]: https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md [Features we expect every widget to implement]: https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md#features-we-expect-every-widget-to-implement [CLA]: https://cla.developers.google.com/ [flutter/tests]: https://github.com/flutter/tests [breaking change policy]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#handling-breaking-changes [Discord]: https://github.com/flutter/flutter/blob/main/docs/contributing/Chat.md [Data Driven Fixes]: https://github.com/flutter/flutter/blob/main/docs/contributing/Data-driven-Fixes.md
67 lines
3.2 KiB
Markdown
67 lines
3.2 KiB
Markdown
# Engine disk footprint
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Here are all the tools to help track and debug the disk size of the Flutter
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engine.
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## Treemaps
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For each commit to [flutter/flutter](https://github.com/flutter/flutter) the
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Chromebots generate treemaps illustrating the sizes of the individual components
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within release builds of `libflutter.so`. The treemap is uploaded to Google
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Cloud Storage and linked from the
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[LUCI](https://ci.chromium.org/p/flutter/g/engine/console) console.
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To find a treemap for a given commit follow these steps:
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1) go to the list of all flutter commits:
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<https://github.com/flutter/flutter/commits/main/>
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1) find the commit you want to evaluate, then click on the green checkbox to see
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the checks
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1) find the check titled `Linux linux_android_aot_engine`, click on `details`
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1) Click on `View more details on flutter-dashboard` to get access to the LUCI
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build page (example:
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<https://ci.chromium.org/ui/p/flutter/builders/prod/Linux%20linux_android_aot_engine/17969/overview>).
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1) expand the section called `launch builds`
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1) find the launched build named something like `Linux Production Engine Drone
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for ci/android_release_arm64`, click it (example
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<https://ci.chromium.org/ui/p/flutter/builders/prod/Linux%20Production%20Engine%20Drone/1294317/overview>).
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1) look for the build section called `log links`, click the `index.html` link
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under it (example:
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<https://storage.googleapis.com/flutter_logs/engine/96fe3b3df509d451116124f0abbd288e36a03805/builder/ff60e5a3-b415-42ae-a7b4-025b1af8ec71/index.html>).
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Treemaps can also be generated locally with the following call:
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```shell
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flutter/ci/binary_size_treemap.sh <path/to/libflutter.so> <output_directory>
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```
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## Benchmarks
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In [devicelab](https://github.com/flutter/flutter/tree/main/dev/devicelab) we
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run various benchmarks to track the APK/IPA sizes and various (engine) artifacts
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contained within. These benchmarks run for every commit to
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[flutter/flutter](https://github.com/flutter/flutter) and are visible on our
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[build dashboard](https://flutter-dashboard.appspot.com/). The most relevant
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benchmarks for engine size are:
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* APK/IPA size of Flutter Gallery
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* Android: `flutter_gallery_android__compile/release_size_bytes`
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* iOS: `flutter_gallery_ios__compile/release_size_bytes`
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* APK/IPA size of minimal hello_world app
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* Android: `hello_world_android__compile/release_size_bytes`
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* iOS: `hello_world_ios__compile/release_size_bytes`
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* Size of bundled `icudtl.dat`
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* Compressed in APK: `hello_world_android__compile/icudtl_compressed_bytes`
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* Uncompressed: `hello_world_android__compile/icudtl_uncompressed_bytes`
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* Size of bundled `libflutter.so` (release mode)
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* Compressed in APK: `hello_world_android__compile/libflutter_compressed_bytes`
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* Uncompressed: `hello_world_android__compile/libflutter_uncompressed_bytes`
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* Size of VM & isolate snapshots (data and instructions)
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* Compressed in APK: `hello_world_android__compile/snapshot_compressed_bytes`
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* Uncompressed: `hello_world_android__compile/snapshot_uncompressed_bytes`
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## Comparing AOT Snapshot Sizes
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A detailed comparison of AOT snapshot sizes can be performed using the
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[instructions documented here](./benchmarks/Comparing-AOT-Snapshot-Sizes.md).
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