tsserver.js High CPU usage

[fotonmoton]

Issue Type: Performance Issue

tsserver.js constantly using up to 120% of CPU even if nothing happening.

foton      590  2.0  1.7 1942636 290164 ?      Sl   13:08   0:17 /usr/share/code/code --type=renderer --no-sandbox --service-pipe-token=A216D35A621259A0C0B481D29BB512F6 --lang=en-US --app-path=/usr/share/code/resources/app --node-integration=true --webview-tag=true --no-sandbox --background-color=#2e3440 --num-raster-threads=4 --enable-main-frame-before-activation --enable-compositor-image-animations --service-request-channel-token=A216D35A621259A0C0B481D29BB512F6 --renderer-client-id=7 --shared-files=v8_context_snapshot_data:100,v8_natives_data:101
foton      624  0.5  0.9 1219748 147324 ?      Sl   13:08   0:04 /usr/share/code/code --nolazy --inspect=47366 /usr/share/code/resources/app/out/bootstrap-fork --type=extensionHost
foton      676  0.0  0.4 996704 69680 ?        Sl   13:08   0:00 /usr/share/code/code /usr/share/code/resources/app/out/bootstrap-fork --type=watcherService
foton      695  117  1.7 1229440 287392 ?      Rl   13:08  15:54 /usr/share/code/code /usr/share/code/resources/app/extensions/node_modules/typescript/lib/tsserver.js --useInferredProjectPerProjectRoot --enableTelemetry --cancellationPipeName /tmp/vscode-typescript/88399acf99a2f7a86c76/tscancellation-dbf5fe213afd4050de43.tmp* --locale en --noGetErrOnBackgroundUpdate --validateDefaultNpmLocation
foton      697  0.2  0.8 1074328 140940 ?      Sl   13:08   0:02 /usr/share/code/code /home/foton/.vscode/extensions/dbaeumer.vscode-eslint-1.9.0/server/out/eslintServer.js --node-ipc --clientProcessId=624
foton      771  0.2  0.5 1006880 83156 ?       Sl   13:08   0:01 /usr/share/code/code /usr/share/code/resources/app/extensions/node_modules/typescript/lib/typingsInstaller.js --globalTypingsCacheLocation /home/foton/.cache/typescript/3.5 --enableTelemetry --typesMapLocation /usr/share/code/resources/app/extensions/node_modules/typescript/lib/typesMap.json --validateDefaultNpmLocation
foton      874  0.0  0.3 964912 63128 ?        Sl   13:08   0:00 /usr/share/code/code /usr/share/code/resources/app/extensions/json-language-features/server/dist/jsonServerMain --node-ipc --clientProcessId=624
foton     8047  0.2  0.5 1120412 96956 ?       Sl   13:18   0:00 /usr/share/code/code --type=renderer --no-sandbox --service-pipe-token=A5450A4F3BE7B82537FEB2ADF80F9893 --lang=en-US --app-path=/usr/share/code/resources/app --node-integration=true --webview-tag=true --no-sandbox --background-color=#2e3440 --num-raster-threads=4 --enable-main-frame-before-activation --enable-compositor-image-animations --service-request-channel-token=A5450A4F3BE7B82537FEB2ADF80F9893 --renderer-client-id=9 --shared-files=v8_context_snapshot_data:100,v8_natives_data:101
foton     9113  1.0  0.6 1149136 110552 ?      Sl   13:19   0:01 /usr/share/code/code --type=renderer --no-sandbox --service-pipe-token=69F6496F95F360D39FF03512B5E37C83 --lang=en-US --app-path=/usr/share/code/resources/app --node-integration=true --webview-tag=true --no-sandbox --background-color=#2e3440 --num-raster-threads=4 --enable-main-frame-before-activation --enable-compositor-image-animations --service-request-channel-token=69F6496F95F360D39FF03512B5E37C83 --renderer-client-id=11 --shared-files=v8_context_snapshot_data:100,v8_natives_data:101
foton    13617  0.0  0.0   4628   864 ?        S    13:21   0:00 /bin/sh -c "/usr/share/code/resources/app/out/vs/base/node/cpuUsage.sh" 23645 23649 23693 23841
foton    13618  0.0  0.0  12884  3296 ?        S    13:21   0:00 /bin/bash /usr/share/code/resources/app/out/vs/base/node/cpuUsage.sh 23645 23649 23693 23841
foton    13630  0.0  0.0  14428  1012 pts/2    S+   13:21   0:00 grep --color=auto code
foton    23645  2.5  0.8 1572416 144304 ?      Ssl  11:59   2:06 /usr/share/code/code .
foton    23649  0.0  0.2 362020 40468 ?        S    11:59   0:00 /usr/share/code/code --type=zygote --no-sandbox
foton    23693  0.9  0.4 521616 80380 ?        Sl   11:59   0:44 /usr/share/code/code --type=gpu-process --no-sandbox --gpu-preferences=KAAAAAAAAACAAACAAQAAAAAAAAAAAGAAEAAAAAAAAAAAAAAAAAAAAAgAAAAAAAAA --service-request-channel-token=DA435E0343A12CC796EB65F030FE8743
foton    23841  0.0  0.7 1179000 123948 ?      Sl   11:59   0:02 /usr/share/code/code --type=renderer --no-sandbox --service-pipe-token=42D74D3D9394404F25E80D3A2C8A8935 --lang=en-US --app-path=/usr/share/code/resources/app --node-integration=true --webview-tag=true --no-sandbox --background-color=#2e3440 --disable-blink-features=Auxclick --num-raster-threads=4 --enable-main-frame-before-activation --enable-compositor-image-animations --service-request-channel-token=42D74D3D9394404F25E80D3A2C8A8935 --renderer-client-id=6 --shared-files=v8_context_snapshot_data:100,v8_natives_data:101

VS Code version: Code 1.35.1 (c7d83e57cd18f18026a8162d042843bda1bcf21f, 2019-06-12T14:27:31.086Z)
OS version: Linux x64 4.15.0-51-generic

System Info

Item	Value
CPUs	Intel(R) Core(TM) i7-8550U CPU @ 1.80GHz (8 x 2500)
GPU Status	2d_canvas: enabled checker_imaging: disabled_off flash_3d: enabled flash_stage3d: enabled flash_stage3d_baseline: enabled gpu_compositing: enabled multiple_raster_threads: enabled_on native_gpu_memory_buffers: disabled_software rasterization: disabled_software surface_synchronization: enabled_on video_decode: unavailable_off webgl: enabled webgl2: enabled
Load (avg)	2, 2, 2
Memory (System)	15.55GB (4.84GB free)
Process Argv	.
Screen Reader	no
VM	0%

Process Info

CPU %	Mem MB	   PID	Process
    0	   127	 23645	code main
    0	    32	 23649	   zygote
    0	   111	 23841	     shared-process
    0	    80	 23693	   gpu-process

Workspace Info

|  Window (Controls.tsx - beditor - Visual Studio Code)
|    Folder (beditor): 72 files
|      File types: tsx(20) ts(15) js(13) map(4) eslintrc(3) json(2) jpg(2)
|                  ico(2) env(1) browserslistrc(1)
|      Conf files: package.json(1) tsconfig.json(1);

Extensions (19)

Extension	Author (truncated)	Version
meson	asa	1.2.0
vscode-intelephense-client	bme	1.0.14
vscode-eslint	dba	1.9.0
EditorConfig	Edi	0.13.0
php-debug	fel	1.13.0
reasonml	fre	1.0.38
42header	kub	0.42.9
dune	mae	0.0.5
dotenv	mik	1.0.1
vscode-docker	ms-	0.6.4
cpptools	ms-	0.23.1
Go	ms-	0.11.0
debugger-for-chrome	msj	4.11.5
advanced-new-file	pat	1.2.0
material-icon-theme	PKi	3.8.0
sass-indented	rob	1.5.1
code-settings-sync	Sha	3.3.0
vscode-fileutils	sle	2.14.5
polacode-fork	Tox	0.5.1

(2 theme extensions excluded)

[fotonmoton]

downgrading to 1.35 or 1.34 fix the issue, tsserver peaks only when I type something.

[fotonmoton]

Seems like downgrade do not resolve the problem. After some work tsserver again begin consume 100% CPU constantly in editor with two tabs opened and no action.

[sandersn]

@fotonmoton can you do one of the following?

1. Reduce the problem to a small repro.
2. Share the code that causes the bug.
3. Share the tsserver log from when the bug happens (see https://github.com/microsoft/TypeScript/wiki/Providing-Visual-Studio-Repro-Steps#typescript-server-log, and substitute “VS Code” for “VS”).

For [1], it is probably easiest to start by deleting your node_modules folder and checking whether the problem reproduces. If so, then the bug is exclusively in your code and you don’t have to worry about types from packages.

[sandersn]

@fotonmoton I assigned this bug to you to gather more info. Please unassigned yourself when you are ready for me to look at it again.

[mjbvz]

For VS Code, collecting the TS Server log is actually much easier:

1. Set "typescript.tsserver.log": "verbose",
2. Restart VS Code and reproduce the problem
3. In VS Code, run the TypeScript: Open TS Server log command
4. This should open a tsserver.log file

[fotonmoton]

@sandersn, ok, try to find out in which case tsserver peaks and create repo with code if I find something. @mjbvz Thanks for suggestion!

[fotonmoton]

For now I upgrade VS Code to 1.35.1 and can't reproduce described behavior, I enable verbose tsserver log and if something happen will submit output.

[marques-p44]

I'm still having CPU issues as well. I'll attach my tsserver.log output.
tsserver-log-output.txt
Does anything jump out as to why it takes sometimes 8 - 12 seconds to finish typechecking?

[sandersn]

@marques-p44 you have a number of packages with performance problems that have recently been fixed, like lodash and styled-components. I believe material-ui might have perf problems, though I'm not sure.

1. Can you upgrade your dependencies to the latest version and see what perf is like?
2. Can you open a new bug to track this issue? It's hard to know the root cause for perf problems, but it's likely different from that of @fotonmoton's problem.