Sdk: Dart Analyzer, high CPU, massive log file

[SteveAlexander]

I'm regularly (several times a day) going through a cycle of VS Code becoming unusable due to the Analyzer using all the CPU. I have the log file enabled, and it quickly writes multi-gigabyte log files.

I don't have a clean reproduction of this at this moment — I'll look at that later.

When it starts going wrong, the log file looks like this: (I manually split the lines to make this appear readable in github)

1602504045559:Noti:{"event"::"completion.availableSuggestions","params"::{"changedLibraries"::
[{"id"::0,"uri"::"package::projectname/sync/database.dart","items"::
[{"label"::"$ItemsTable","declaringLibraryUri"::"package::projectname/sync/database.dart","element"::
{"kind"::"CLASS","name"::"$ItemsTable","location"::{"file"::"/Users/steve/code/companyname/projectname-
app/projectname/lib/sync/database.g.dart","offset"::20093,"length"::0,"startLine"::614,"startColumn"::7},"flags"::0},"relevanceTags"::
["ElementKind.CLASS","package::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart:
:::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$Item
sTable","package::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable",
"package::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","packa
ge::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","package::proj
ectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","package::projectnam
e/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/
database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/databas
e.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart:::
:$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$Items
Table","package::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","
package::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","packag
e::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","package::proje
ctname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","package::projectname
/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/d
atabase.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database
.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::
$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsT
able","package::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","p
ackage::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","package:
:projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","package::project
name/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","package::projectname/s
ync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/dat
abase.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.d
art::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$It
emsTable","package::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTab
le","package::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","pac
kage::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","package::p
rojectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","package::projectn
ame/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","package::projectname/sy
nc/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/data
base.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.da
rt::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$Ite
msTable","package::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTabl
e","package::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","pack
age::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","package::pr
ojectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","package::projectna
me/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","package::projectname/syn
c/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/datab
ase.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dar
t::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$Ite
msTable","package::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTabl
e","package::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","pack
age::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","package::pr
ojectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","package::projectna
me/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","package::projectname/syn
c/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/datab
ase.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dar
t::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$Ite
msTable","package::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTabl
e","package::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","pack
age::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","package::pr
ojectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","package::projectna
me/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","package::projectname/syn
c/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/datab
ase.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dar
t::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$Ite
msTable","package::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTabl
e","package::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","pack
age::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","package::pr
ojectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","package::projectna
me/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","package::projectname/syn
c/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/datab
ase.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dar
t::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$Ite
msTable","package::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTabl
e","package::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","pack
age::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","package::pr
ojectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","package::projectna
me/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","package::projectname/syn
c/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/datab
ase.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dar
t::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$Ite
msTable","package::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTabl
e","package::projectname/sync/database.dart::::$ItemsTable","package::projectname/sync/database.dart::::$ItemsTable","pack
age::projectname/sync/database.dart::::$ItemsTable:

The line goes on a lot longer than this.

I am using https://pub.dev/packages/moor, which uses generated code at database.g.dart and creates things like $ItemsTable as part of its functioning.

• VS Code version: 1.49.3
• Dart extension version: 3.15.0
• Dart/Flutter SDK version: Dart SDK version: 2.10.0 (stable) (Mon Sep 28 09:21:23 2020 +0200) on "macos_x64"

[SteveAlexander]

The log says "location"::{"file"::"/Users/steve/code/companyname/projectname- app/projectname/lib/sync/database.g.dart","offset"::20093,"length"::0,"startLine"::614,"startColumn"::7}. That's this generated code:

class $ItemsTable extends Items with TableInfo<$ItemsTable, Item> {
  final GeneratedDatabase _db;
  final String _alias;
  $ItemsTable(this._db, [this._alias]);
  final VerificationMeta _baseMeta = const VerificationMeta('base');
  GeneratedIntColumn _base;
  @override
  GeneratedIntColumn get base => _base ??= _constructBase();

[SteveAlexander]

This issue is making it painful to develop a flutter app. I get about 5 minutes of use from the analyzer before I need to restart it.

Is there anything I can do to work around the problem? Or anything I can do to help towards a fix?

[Auuufff]

I have the same issue in Android Studio and VSC.

[seanmc86]

Same issue in VSCode and IDEA. Any IDEs open with the Dart plugin active, regardless of whether there are active debugging sessions or not, steadily take up more and more CPU usage until they become unusable after a few minutes.

Dart SDK version: 2.10.3 (stable) (Tue Oct 27 14:44:30 2020 +0100) on "macos_x64

[DanTup]

Can anyone reproduce this in a small sample project that can be shared?

[SteveAlexander]

I've been trying to do this — unfortunately, my project is not currently suffering from this, and I don't have a straightforward way to go back to a state that does reproduce.

When I next experience the problem, I'll take a copy of the project tree, and try to pare it down to a reproducible test case.

Unfortunately I cannot say when I'm able to do this, as I need to see when I start experiencing this problem again.

[seanmc86]

I've been unable to reproduce the issue in all except one of my repos. It's a Flutter desktop project, but using go-flutter & hover rather than the official desktop-embedding (I'm not sure if that info helps).

I saw another thread in which the following information was requested, so I'm dumping it in. Anything else I can look for log-wise?

code --status
Version: Code 1.51.1 (e5a624b788d92b8d34d1392e4c4d9789406efe8f, 2020-11-11T01:11:34.018Z)
OS Version: Darwin x64 19.6.0
CPUs: Intel(R) Core(TM) i7-8750H CPU @ 2.20GHz (12 x 2200)
Memory (System): 16.00GB (1.99GB free)
Load (avg): 5, 6, 5
VM: 0%
Screen Reader: no
Process Argv: --crash-reporter-id 79b16596-d9b7-4bf8-9ba2-da74fa5e7016
GPU Status: 2d_canvas: enabled
flash_3d: enabled
flash_stage3d: enabled
flash_stage3d_baseline: enabled
gpu_compositing: enabled
metal: disabled_off
multiple_raster_threads: enabled_on
oop_rasterization: enabled
opengl: enabled_on
protected_video_decode: unavailable_off
rasterization: enabled
skia_renderer: disabled_off_ok
video_decode: enabled
webgl: enabled
webgl2: enabled

CPU % Mem MB PID Process
2 115 41470 code main
3 66 41473 gpu-process
0 33 41475 utility
0 98 41538 shared-process
0 0 42160 /bin/ps -ax -o pid=,ppid=,pcpu=,pmem=,command=
9 262 41561 window (hovering_attach_options.dart — desktop-app)
0 0 41562 /bin/zsh -l
0 16 41646 hover run
6 1016 41899 ./go/build/outputs/darwin/worldr
0 0 41911 bash /Users/sean/SDK/flutter/bin/flutter attach --target lib/main_desktop.dart --device-id flutter-tester --debug-uri http://127.0.0.1:50300/
1 213 41928 /Users/sean/SDK/flutter/bin/cache/dart-sdk/bin/dart --disable-dart-dev --packages=/Users/sean/SDK/flutter/packages/flutter_tools/.packages /Users/sean/SDK/flutter/bin/cache/flutter_tools.snapshot attach --target lib/main_desktop.dart --device-id flutter-tester --debug-uri http://127.0.0.1:50300/
0 623 41958 electron_node config.js
0 98 41566 extensionHost
80 180 41574 /Users/sean/SDK/flutter/bin/cache/dart-sdk/bin/dart /Users/sean/SDK/flutter/bin/cache/dart-sdk/bin/snapshots/analysis_server.dart.snapshot --client-id=VS-Code --client-version=3.16.0
0 0 41575 bash /Users/sean/SDK/flutter/bin/flutter daemon
0 147 41594 /Users/sean/SDK/flutter/bin/cache/dart-sdk/bin/dart --disable-dart-dev --packages=/Users/sean/SDK/flutter/packages/flutter_tools/.packages /Users/sean/SDK/flutter/bin/cache/flutter_tools.snapshot daemon
0 0 41631 /usr/bin/script -t 0 /dev/null xcrun xcdevice observe --both
0 33 41632 /Applications/Xcode.app/Contents/Developer/usr/bin/xcdevice observe --both
0 557 41567 watcherService
0 33 41568 searchService
0 0 42083 /bin/zsh -l
0 0 42143 bash /usr/local/bin/code --status
17 33 42153 electron_node cli.js

Workspace Stats:
| Window (hovering_attach_options.dart — desktop-app)
| Folder (desktop-app): 4862 files
| File types: pcm(755) timestamp(610) svg(400) d(242) dia(237) o(237)
| dart(157) hmap(150) h(141) otf(64)
| Conf files: launch.json(1)
| Launch Configs: dart(2)

[DanTup]

@seanmc86 I think the most useful thing would be a project that repros it. Are you able to duplicate your project that has this and strip out anything you can't share to see if it still occurs in a form you could share?

[seanmc86]

Because it was so project-specific in my case, I was quite certain it must be something to do with either the files in that project's folder or the type of project files I was working with.
Turns out that that deleting the project folder and recloning it resolved the issue in the short term, though I do see instances of the usage starting to slowly creep up again over time. I'm not sure if it's a git thing or some other hidden files being created by the hot reloads/restarts I'm unaware of, but either way it doesn't seem to be a dart sdk issue.