build_runner in watch mode leaks memory

[AlexanderFarkas]

I've been using watch mode the whole day (started with flutter pub run build_runner watch) and it ended up occupying 11 Gb of RAM.
Restart sets it back to normal: 518 Mb

• Dart SDK version: 3.8.1 (stable) (Wed May 28 00:47:25 2025 -0700) on "macos_arm64"
• build_runner: 2.4.15
• macOS 15.0 24A335 darwin-arm64

Here is dev dependencies (with all builders included):

dev_dependencies:
  flutter_test:
    sdk: flutter

  build_runner: ^2.4.15
  flutter_lints: ^2.0.0
  freezed: ^2.5.7
  json_serializable: ^6.8.0
  retrofit_generator: ^8.2.0
  integration_test:
    sdk: flutter

freezed - generation of data classes
json_serializable - generation of toJson/fromJson
retrofit_generator - generation of typed routes for dio

Here is my build.yaml:

global_options:
  freezed:freezed:
    runs_before:
      - retrofit_generator:retrofit_generator
  json_serializable:json_serializable:
    runs_before:
      - retrofit_generator:retrofit_generator
targets:
  $default:
    builders:
      json_serializable:
        options:
          explicit_to_json: true
          checked: true
          field_rename: snake
      freezed:
        options:
          union_key: type
          union_value_case: snake
      retrofit_generator:
        generate_for:
          - lib/data/data_sources/**/*.dart

After a single re-run, it started occupying 1.98 Gb of RAM and increases by ~20MB on each change

Here is logs with --verbose. To clarify, it was triggered by a single space + "Save" without actually changing anything:

[  +15 ms] executing: sysctl hw.optional.arm64
[   +5 ms] Exit code 0 from: sysctl hw.optional.arm64
[        ] hw.optional.arm64: 1
[  +32 ms] Artifact Instance of 'AndroidGenSnapshotArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'AndroidInternalBuildArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IOSEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterWebSdk' is not required, skipping update.
[        ] Artifact Instance of 'LegacyCanvasKitRemover' is not required, skipping update.
[   +1 ms] Artifact Instance of 'WindowsEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerDebugSymbols' is not required, skipping update.
[  +20 ms] Artifact Instance of 'MaterialFonts' is not required, skipping update.
[        ] Artifact Instance of 'GradleWrapper' is not required, skipping update.
[        ] Artifact Instance of 'AndroidGenSnapshotArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'AndroidInternalBuildArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IOSEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterWebSdk' is not required, skipping update.
[        ] Artifact Instance of 'LegacyCanvasKitRemover' is not required, skipping update.
[        ] Artifact Instance of 'FlutterSdk' is not required, skipping update.
[        ] Artifact Instance of 'WindowsEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerDebugSymbols' is not required, skipping update.
[        ] Artifact Instance of 'IosUsbArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IosUsbArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IosUsbArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IosUsbArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IosUsbArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FontSubsetArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'PubDependencies' is not required, skipping update.
[  +56 ms] executing: [/Users/alexander/{REDUCTED}/] /Users/alexander/fvm/versions/3.32.1/bin/cache/dart-sdk/bin/dart pub --suppress-analytics run build_runner watch --verbose
MSG : Deprecated. Use `dart run` instead.
[INFO] Entrypoint:Generating build script...
[INFO] Entrypoint:Generating build script completed, took 217ms

[INFO] Watch:Setting up file watchers...
[INFO] Watch:Setting up file watchers completed, took 6ms

[INFO] Watch:Waiting for all file watchers to be ready...
[INFO] Watch:Waiting for all file watchers to be ready completed, took 937ms

[INFO] BuildDefinition:Initializing inputs
[INFO] BuildDefinition:Reading cached asset graph...
[INFO] BuildDefinition:Reading cached asset graph completed, took 455ms

[INFO] BuildDefinition:Checking for updates since last build...
[INFO] BuildDefinition:Checking for updates since last build completed, took 1.2s

[INFO] Build:Running build...
[INFO] Build:Running build completed, took 56ms

[INFO] Build:Caching finalized dependency graph...
[INFO] Build:Caching finalized dependency graph completed, took 230ms

[INFO] Build:Succeeded after 304ms with 0 outputs (0 actions)

[INFO] Watch:------------------------------------------------------------------------

[INFO] Watch:Starting Build

[INFO] Build:Updating asset graph...
[INFO] Build:Updating asset graph completed, took 9ms

[INFO] Build:Running build...
[INFO] Heartbeat:1.1s elapsed, 0/16 actions completed.
[WARNING] freezed on lib/{REDUCTED}.dart:
Your current `analyzer` version may not fully support your current SDK version.

Analyzer language version: 3.7.0
SDK language version: 3.8.0

Please update to the latest `analyzer` version (7.4.5) by running
`flutter packages upgrade`.

If you are not getting the latest version by running the above command, you
can try adding a constraint like the following to your pubspec to start
diagnosing why you can't get the latest version:

dev_dependencies:
  analyzer: ^7.4.5

[INFO] Heartbeat:2.2s elapsed, 1/16 actions completed.
[INFO] Heartbeat:3.3s elapsed, 1/18 actions completed.
[INFO] Heartbeat:4.3s elapsed, 33/72 actions completed.
[INFO] Heartbeat:5.4s elapsed, 260/276 actions completed.
[INFO] Heartbeat:22.9s elapsed, 260/276 actions completed.
[WARNING] Heartbeat:
No actions completed for 17.6s, waiting on:
  - freezed on lib/{REDUCTED}.dart
  - freezed on lib/{REDUCTED}.dart
  - freezed on lib/{REDUCTED}.dart
  - freezed on lib/{REDUCTED}.dart
  - freezed on lib/{REDUCTED}.dart
  .. and 11 more

[FINE] freezed on lib/{REDUCTED}.dart:Running FreezedGenerator
[FINE] freezed on lib/{REDUCTED}.dart:Running FreezedGenerator
[FINE] freezed on lib/{REDUCTED}.dart:Running FreezedGenerator
[FINE] freezed on lib/{REDUCTED}.dart:Running FreezedGenerator
[FINE] freezed on lib/{REDUCTED}.dart:Running FreezedGenerator
[FINE] freezed on lib/{REDUCTED}.dart:Running FreezedGenerator
[FINE] freezed on lib/{REDUCTED}.dart:Running FreezedGenerator
[FINE] freezed on lib/{REDUCTED}.dart:Running FreezedGenerator
[FINE] freezed on lib/{REDUCTED}.dart:Running FreezedGenerator
[FINE] freezed on lib/{REDUCTED}.dart:Running FreezedGenerator
[FINE] freezed on lib/{REDUCTED}.dart:Running FreezedGenerator
[FINE] freezed on lib/{REDUCTED}.dart:Running FreezedGenerator
[FINE] freezed on lib/{REDUCTED}.dart:Running FreezedGenerator
[FINE] freezed on lib/{REDUCTED}.dart:Running FreezedGenerator
[FINE] freezed on lib/{REDUCTED}.dart:Running FreezedGenerator
[FINE] freezed on lib/{REDUCTED}.dart:Running FreezedGenerator
[INFO] Heartbeat:25.4s elapsed, 276/278 actions completed.
[FINE] freezed on lib/{REDUCTED}.dart:Running FreezedGenerator
[FINE] freezed on lib/{REDUCTED}.dart:Running FreezedGenerator
[FINE] freezed on lib/{REDUCTED}.dart:Running FreezedGenerator
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[FINE] freezed on lib/{REDUCTED}.dart:Running FreezedGenerator
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[FINE] freezed on lib/{REDUCTED}.dart:Running FreezedGenerator
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[FINE] freezed on lib/{REDUCTED}.dart:Running FreezedGenerator
[FINE] freezed on lib/{REDUCTED}.dart:Running FreezedGenerator
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[FINE] freezed on lib/{REDUCTED}.dart:Running FreezedGenerator
[FINE] freezed on lib/{REDUCTED}.dart:Running FreezedGenerator
[FINE] freezed on lib/{REDUCTED}.dart:Running FreezedGenerator
[FINE] freezed on lib/{REDUCTED}.dart:Running FreezedGenerator
[FINE] freezed on lib/{REDUCTED}.dart:Running FreezedGenerator
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[FINE] freezed on lib/{REDUCTED}.dart:Running FreezedGenerator
[FINE] freezed on lib/{REDUCTED}.dart:Running FreezedGenerator
[FINE] freezed on lib/{REDUCTED}.dart:Running FreezedGenerator
[FINE] freezed on lib/{REDUCTED}.dart:Running FreezedGenerator
[FINE] freezed on lib/{REDUCTED}.dart:Running FreezedGenerator
[FINE] freezed on lib/{REDUCTED}.dart:Running FreezedGenerator
[FINE] freezed on lib/{REDUCTED}.dart:Running FreezedGenerator
[FINE] freezed on lib/{REDUCTED}.dart:Running FreezedGenerator
[FINE] freezed on lib/{REDUCTED}.dart:Running FreezedGenerator
[FINE] freezed on lib/{REDUCTED}.dart:Running FreezedGenerator
[FINE] freezed on lib/{REDUCTED}.dart:Running FreezedGenerator
[FINE] freezed on lib/{REDUCTED}.dart:Running FreezedGenerator
[FINE] freezed on lib/{REDUCTED}.dart:Running FreezedGenerator
[FINE] freezed on lib/{REDUCTED}.dart:Running FreezedGenerator
[FINE] freezed on lib/{REDUCTED}.dart:Running FreezedGenerator
[FINE] freezed on lib/{REDUCTED}.dart:Running FreezedGenerator
[FINE] freezed on lib/{REDUCTED}.dart:Running FreezedGenerator
[FINE] freezed on lib/{REDUCTED}.dart:Running FreezedGenerator
[FINE] freezed on lib/{REDUCTED}.dart:Running FreezedGenerator
[FINE] freezed on lib/{REDUCTED}.dart:Running FreezedGenerator
[FINE] freezed on lib/{REDUCTED}.dart:Running FreezedGenerator
[FINE] freezed on lib/{REDUCTED}.dart:Running FreezedGenerator
[FINE] freezed on lib/{REDUCTED}.dart:Running FreezedGenerator
[INFO] Heartbeat:29.1s elapsed, 321/337 actions completed.
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
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[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonSerializableGenerator - 1 of 2
[FINE] json_serializable on lib/{REDUCTED}.dart:Running JsonLiteralGenerator - 2 of 2
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[INFO] Build:Running build completed, took 37.5s

[INFO] Build:Caching finalized dependency graph...
[INFO] Build:Caching finalized dependency graph completed, took 334ms

[INFO] Build:Succeeded after 37.9s with 355 outputs (865 actions)

Edit 1:
Removing all builder packages fixes the issue - memory doesn't leak anymore 😄
What's more interesting - using these builders separately (exluding them one by one from dev_dependencies) also doesn't leak memory. But using them 3 together results in incremental increases of memory usage.

[gmpassos]

Just sharing some experience with Dart memory management.

By default, Dart’s garbage collector (GC) has no upper memory limit. It will keep allocating memory as needed before releasing it or triggering a full GC to avoid unnecessarily growing the heap.

In my case, I'm running a backend written in Dart and compiled to native (dart compile exe backend.dart) on a Linux server with limited memory (we only need around 1 GB for the backend).

To prevent Dart’s GC from allocating more memory than the server allows (2 GB total), we set the following parameter:

--old_gen_heap_size=1300

Since the backend is compiled as a self-contained executable, this must be passed as an environment variable using DART_VM_OPTIONS:

export DART_VM_OPTIONS=--verbose_gc,--old_gen_heap_size=1300

Without this, the backend assumes it owns the entire server and tries to allocate memory with a default limit of 32 GB.

In my opinion, any process using a GC should have a memory limit based on the actual needs of the application, especially when running alongside other processes. The required memory depends on the size and complexity of the project, so it’s not straightforward to define a sensible default for every case.

[davidmorgan]

Thanks for the detailed report--I'll be happy to investigate to see if I can figure out what's going on.

But, the currently published version of build_runner has been significantly refactored/rewritten, the new version will launch soon. So it doesn't make sense to debug with the version you're using. If you'd like to try the new version to see if you get the same problem, you can do so by following the instructions here

#3834

if you do see the same problem, I can investigate once the new version is launched. I'm currently working on logging changes that will make it a lot clearer where the time is being spent, which may help; I can add further logging if needed.

Thanks!

[AlexanderFarkas]

I tried changing dev_dependencies as suggested to :

dependency_overrides:
  archive: 3.6.1

  build:
    git:
      url: https://github.com/dart-lang/build
      path: build
      ref: effc827f4eb1d7ffada8ef13fb3f6992704f1b00
  build_config:
    git:
      url: https://github.com/dart-lang/build
      path: build_config
      ref: effc827f4eb1d7ffada8ef13fb3f6992704f1b00
  build_modules:
    git:
      url: https://github.com/dart-lang/build
      path: build_modules
      ref: effc827f4eb1d7ffada8ef13fb3f6992704f1b00

  build_resolvers:
    git:
      url: https://github.com/dart-lang/build
      path: build_resolvers
      ref: effc827f4eb1d7ffada8ef13fb3f6992704f1b00
  build_runner:
    git:
      url: https://github.com/dart-lang/build
      path: build_runner
      ref: effc827f4eb1d7ffada8ef13fb3f6992704f1b00
  build_runner_core:
    git:
      url: https://github.com/dart-lang/build
      path: build_runner_core
      ref: effc827f4eb1d7ffada8ef13fb3f6992704f1b00
  build_test:
    git:
      url: https://github.com/dart-lang/build
      path: build_test
      ref: effc827f4eb1d7ffada8ef13fb3f6992704f1b00
  build_web_compilers:
    git:
      url: https://github.com/dart-lang/build
      path: build_web_compilers
      ref: effc827f4eb1d7ffada8ef13fb3f6992704f1b00

Problem didn't go away - memory still leaks after each rebuild.

[gmpassos]

@davidmorgan

Is it possible to run build_runner with a heap limit, like --old_gen_heap_size=700?

Note that the process using 1.9G doesn’t necessarily mean there’s a memory leak—it could just be the GC allocating memory because there’s no limit, especially if it’s a process with a lot of object allocations.

[AlexanderFarkas]

@gmpassos You've probably missed one of the screenshots: build_runner process takes 11GB of RAM, while starting from 500mb

[gmpassos]

@gmpassos You've probably missed one of the screenshots: build_runner process takes 11GB of RAM, while starting from 500mb

Wow, 11G — definitely a memory leak! Sorry, I didn't see the image.

[davidmorgan]

Definitely looks like a bug, I'll investigate after the new release is out. Thanks.