Initializing js/ts language features extremely slow on WSL2

[andreialecu]

Issue Type: Bug

I have a specific workspace created using yarn workspaces that when opened in WSL2 will never complete the "Initializing ts/js language features" step.

The problem seems to be the same as the one reported in this comment here, in an issue that was previously closed: #79380 (comment)

The last line in tsserver.log is related to an AddWatch to the main node_modules of the workspace on WSL2. No other errors otherwise.

The same tsserver.log when using Windows quickly passes that step.

The node_modules in the root of the workspace is 815MB and has 77593 files.

VS Code version: Code 1.41.1 (26076a4, 2019-12-18T14:58:56.166Z)
OS version: Windows_NT x64 10.0.19041

System Info

Item	Value
CPUs	Intel(R) Core(TM) i7-7700K CPU @ 4.20GHz (8 x 4200)
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: disabled_off protected_video_decode: unavailable_off rasterization: enabled skia_renderer: disabled_off surface_control: disabled_off surface_synchronization: enabled_on video_decode: enabled viz_display_compositor: enabled_on viz_hit_test_surface_layer: disabled_off webgl: enabled webgl2: enabled
Load (avg)	undefined
Memory (System)	15.96GB (1.63GB free)
Process Argv
Screen Reader	no
VM	0%

[andreialecu]

Last lines of tsserver.log on wsl2:

Info 55   [11:58:12.862] Starting updateGraphWorker: Project: /s/Projects/zzz/packages/yyy/tsconfig.json
Info 56   [11:58:13.399] DirectoryWatcher:: Added:: WatchInfo: /s/Projects/zzz/node_modules 1 Project:  WatchType: node_modules for closed script infos in them

Similar relevant lines from tsserver.log while in Windows mode:

Info 60   [11:43:39.4] Starting updateGraphWorker: Project: s:/Projects/zzz/packages/yyy/tsconfig.json
Info 61   [11:43:39.86] DirectoryWatcher:: Added:: WatchInfo: s:/projects/zzz/node_modules 1 Project:  WatchType: node_modules for closed script infos in them
Info 62   [11:43:39.86] watchDirectory for s:/projects/zzz/node_modules uses cached drive information.
Info 63   [11:43:39.87] Elapsed:: 1ms DirectoryWatcher:: Added:: WatchInfo: s:/projects/zzz/node_modules 1 Project:  WatchType: node_modules for closed script infos in them

[andreialecu]

Interesting, I've left it open for a bit and it wasn't actually hung, it just took a very long time:

Info 56   [11:58:13.399] DirectoryWatcher:: Added:: WatchInfo: /s/Projects/zzz/node_modules 1 Project:  WatchType: node_modules for closed script infos in them
Info 57   [12:3:34.559] Elapsed:: 321159ms DirectoryWatcher:: Added:: WatchInfo: /s/Projects/zzz/node_modules 1 Project:  WatchType: node_modules for closed script infos in them
Info 58   [12:3:34.575] DirectoryWatcher:: Added:: WatchInfo: /s/Projects/zzz/packages/yyy/src 1 Project: /s/Projects/zzz/packages/lets-poker-shared/tsconfig.json WatchType: Failed Lookup Locations

Over 5 minutes on wsl2. Instant on Windows.

[andreialecu]

As a troubleshooting step, I tried the latest nightly of typescript based on this PR: microsoft/TypeScript#35615 (comment)

Info 0    [12:20:46.505] Starting TS Server
Info 1    [12:20:46.505] Version: 3.8.0-dev.20191231

But it didn't help, same behavior.

Edit: Also found: microsoft/TypeScript#33335

[andreialecu]

The issue seems to be: microsoft/WSL#4197

For now it seems that cloning the repository on the ext4 file system of wsl is the way to go. Everything is much faster, and on par with Windows performance after moving the repo and opening from ext4.

Log for reference:

Info 122  [14:14:45.198] Starting updateGraphWorker: Project: /home/aandrei/projects/zzz/tsconfig.json
Info 123  [14:14:45.234] DirectoryWatcher:: Added:: WatchInfo: /home/aandrei/zzz/node_modules 1 Project:  WatchType: node_modules for closed script infos in them
Info 124  [14:14:46.347] Elapsed:: 1113ms DirectoryWatcher:: Added:: WatchInfo: /home/aandrei/zzz/node_modules 1 Project:  WatchType: node_modules for closed script infos in them