[BUG] Extreme CPU and Memory Usage

[m-skolnick]

I'm not sure if this should be a question or a bug:

Is there a way to reduce the CPU and Memory load of the plugin?

I am using VSCode. When I set dart_code_metrics as an analyzer plugin I am seeing an immediate and sustained jump in CPU and Memory usage on my Macbook Pro 2.4ghz 32gb ram.

Here is my pubspec.yaml. I'm currently on flutter version 2.5.1

name: my_flutter_package
publish_to: "none"
version: 1.0.0+1

environment:
  sdk: ">=2.12.0 <3.0.0"
  flutter: ">=2.5.0 <2.6.0"

dev_dependencies:
  dart_code_metrics: ^4.3.0
  flutter_lints: ^1.0.4

Here is my analysis_options.yaml:

include: package:flutter_lints/flutter.yaml

analyzer:
  errors:
    todo: info
    include_file_not_found: ignore
    unrelated_type_equality_checks: error
  exclude:
    - .flutter/**
    - /**/build/**
    - /**/mocks/**
    - /**/l10n/**
  plugins:
    - dart_code_metrics

dart_code_metrics:
  anti-patterns:
    - long-method
    - long-parameter-list
  metrics:
    cyclomatic-complexity: 20
    lines-of-executable-code: 50
    number-of-parameters: 4
    maximum-nesting: 5
  metrics-exclude:
    - test/**
    - .flutter/**
    - /**/build/**
    - /**/mocks/**
    - /**/l10n/**
  rules:
    - newline-before-return
    - no-boolean-literal-compare
    - no-empty-block
    - prefer-trailing-comma
    - prefer-conditional-expressions
    - no-equal-then-else

When I have the plugin in the analyzer plugins, I am seeing this in the analyzer server diagnostics:

As soon as I remove this line and reload my VSCode, I see the following:

plugins:
  - dart_code_metrics

[dkrutskikh]

@m-skolnick please provide flutter / dart versions.

[m-skolnick]

@m-skolnick please provide flutter / dart versions.

Apologies.. I just added the info to my initial comment. flutter: 2.5.1

[dkrutskikh]

@m-skolnick please upgrade to 2.5.3. In this version fixed analysis server memory leaks https://github.com/flutter/flutter/wiki/Hotfixes-to-the-Stable-Channel#253-october-15-2021

[dkrutskikh]

@m-skolnick how long is the period of high CPU utilization? After a couple of minutes, is there a drop in the load?

[m-skolnick]

I'm still seeing the same on flutter 2.5.3.

CPU usage is definitely the highest in the first few minutes.. 90% - 190%, then it's dropping to around 40% after 5 min.

Memory however, steadily climbs to around 5,000 MB, and it stays there no matter how long I let it sit.

First 5 min:

After 10 min:

[incendial]

@m-skolnick hi, so sorry for the long response. It's really hard to say, where the memory leak comes from and we'll need to investigate it better. I think one way to check would be to create an empty plugin and get the memory load metrics. I think we can do this in a few weeks.

[vmalyi]

Experiencing the same issue with Flutter 2.5.3, on macOS 11.6 in VS Code 1.62.3. See analysis_options.yaml attached.

Removing the dart_code_metrics from plugins in analysis_options.yaml helps to bring resource utilization to a normal level but of course deactivates the plugin itself.

Thanks for looking into that!

analysis_options.yaml.zip