vm_snapshot_analysis 0.5.0

Utilities for analysing AOT snapshot size.

Changelog

0.5.0

• Remove dart:io dependency from package lib, and move commands to bin.
• Replace loadProgramInfo util method with loadProgramInfoFromJson, which expects an Object parameter instead of a File parameter.
• buildComparisonTreemap now expects two Object parameters for oldJson and newJson instead of two File parameters.
• compare command now prints difference breakdown by node type when this information is available.

0.4.0

• Add buildComparisonTreemap for constructing treemap representing the diff between two size profiles.
• Implemented support for extracting call graph information from the AOT compiler trace (--trace-precompiler-to flag), see precompiler_trace.dart.
• New command explain dynamic-calls which estimates the impact of different dynamic calls on the resulting AOT snapshot size using information from the size dump (e.g. V8 snapshot profile) and AOT compiler trace.
• summary command can now use information from the AOT compiler trace to group packages/libraries together with their dependencies to given more precise estimate of how much a specific package/library brings into the snapshot.

0.3.0

• Extract treemap construction code into a separate library, to make it reusable.
• Add ability to collapse leaf nodes in a treemap created from V8 snapshot profile. This behavior is programmatically controlled by TreemapFormat format parameter and from CLI via --format flag. The following options are available
  • collapsed essentially renders ProgramInfo as a treemap, individual snapshot nodes are ignored.
  • simplified same as collapsed, but also folds size information from nested functions into outermost function (e.g. top level function or a method) producing easy to consume output.
  • data-and-code collapses snapshot nodes based on whether they represent data or executable code.
  • object-type (default) collapses snapshot nodes based on their type only.
• When computing ProgramInfo from a V8 snapshot profile no longer create ProgramInfoNode for Code nodes which are owned by a function - instead directly attribute the Code node itself and all retained nodes into ProgramInfoNode for the function itself. For stubs (including allocation stubs) create an artificial functionNode instead of using NodeType.other. The only remaining use of NodeType.other is for fields.

0.2.0

• Update CLI help message to avoid referring to a snapshot created by pub as the name of the script.
• Fix owner computation code for V8 profiles: the size of a snapshot node which corresponds to a ProgramInfoNode should be attributed to that ProgramInfoNode and not to its parent. For example Function node corresponds to ProgramInfoNode of type functionNode, previously the size of Function node would be attributed to the parent of this ProgramInfoNode, but it should be attributed to the node itself.
• Update README.md to include more information on how to pass flags to Dart AOT compiler.
• Add ProgramInfoNode.size documentation to clarify the meaning of the member.

0.1.0

• Initial release