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This adds runtime/docs/aot_binary_size_analysis.md describing how to visualize the breakdown of generated code size from our AOT. Change-Id: I63ae3728db808532fad0ca178e1947e5b8280521 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/112397 Reviewed-by: Michael Thomsen <mit@google.com> Commit-Queue: Martin Kustermann <kustermann@google.com>
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AOT code size analysis
The Dart VM's AOT compiler has support for emitting binary size information for all the code that gets generated. This information can then be visualized.
Telling the AOT compiler to generate binary size information
Our AOT compiler accepts an extra --print-instructions-sizes-to=sizes.json
flag. If supplied the AOT compiler will emit binary size information for all
generated functions to sizes.json
.
This flag can be passed to gen_snapshot
directly, or to the various wrapper
scripts (e.g. pkg/vm/tool/precompiler2
):
% tools/build.py -mrelease -ax64 runtime_kernel dart_precompiled_runtime
% pkg/vm/tool/precompiler2 --print-instructions-sizes-to=hello_sizes.json hello.dart hello.dart.aot
Visualizing the information from the binary size json file
To visualize the information emitted by the AOT compiler one can use our binary size analysis tool:
% dart pkg/vm/bin/run_binary_size_analysis.dart hello_sizes.json hello_sizes
Generated file:///.../sdk/hello_sizes/index.html
% chrome hello_sizes/index.html