Extension causes high cpu load

[PedroArSp]

bung87.rails-unresponsive.cpuprofile.txt

• Issue Type: Performance
• Extension Name: rails
• Extension Version: 0.16.2
• OS Version: Windows_NT x64 10.0.18363
• VSCode version: 1.43.2

⚠️ Make sure to attach this file from your home-directory:
⚠️C:\Users\pedro\bung87.rails-unresponsive.cpuprofile.txt

Find more details here: https://github.com/microsoft/vscode/wiki/Explain-extension-causes-high-cpu-load

[nick-skriabin]

experiencing this on mid to large size projects all the time, very annoying. sometimes restarting vs code helps, sometimes not

[bung87]

Could you provide a open source project that I can test? I can't image how large it is , this problem reporting for several months, but I did not face it myself.

[swiknaba]

I do hit this issue regularly as well. VSCode becomes totally unusable, I cannot copy-paste things around, nor save a file. Typing still works (but cannot save it 🤷 ). I have a 3,7 GHz 10-Core Intel Core i9, 32 GB of Memory, and an NVME with enough free space --thus pretty sure, that my machine is not the bottleneck here.

I can't link any project atm, but I am having only one project opened in VSCode, about ~ 7-15 files at the same time. Project size is small to medium; the number of files (roughly):

• 500 .rb
• 150 .vue
• 500 .js
• 50k files in node_modules

The folder is about 3GB in size (including some large media files, which I do not have open in VSCode).
I couldn't find the cpuprofile.txt on my machine 🤷

[bung87]

Thanks!, that's much detail, I never used in such big project, let me see what I can do for this, maybe I'll create a refactor all code. that will take times, I've seen much reporting cpuprofile.txt that may not contains any clue to this. btw "good machine"

[bung87]

as 0.16.11 , I add findFiles maybe reduce the performance issue.

• findFiles in root of document and repect gitignore previous just workspace.findFiles

[coder2000]

I am constantly getting this issue too. Please find my profile attached.
bung87.rails-unresponsive.cpuprofile.txt

[bung87]

looks like it take too much time find symbol when you hover on a symbol. previous reported txt did not contains same content, maybe not same problem or vscode improve its report I guess.

{
            "id": 27,
            "callFrame": {
                "functionName": "provideHover",
                "scriptId": "902",
                "url": "file:///home/coder2000/.vscode/extensions/bung87.rails-0.17.1/dist/extension.js",
                "lineNumber": 32445,
                "columnNumber": 16
            },
            "hitCount": 0,
            "children": [
                28
            ]
        },
        {
            "id": 28,
            "callFrame": {
                "functionName": "getSymbol",
                "scriptId": "902",
                "url": "file:///home/coder2000/.vscode/extensions/bung87.rails-0.17.1/dist/extension.js",
                "lineNumber": 1441,
                "columnNumber": 18
            },
            "hitCount": 31498,
            "positionTicks": [
                {
                    "line": 1454,
                    "ticks": 31498
                }
            ]
        }

[bung87]

table columns on hover now use cached content will not doing file io every time, see if can reduce the problem, don's see any problem with getSymbol

[taylorthurlow]

I'm getting something similar on 0.17.3, not sure if it's related. This one makes my editor lock up but I think it locks up either because this problem has some weird interaction with vscode-neovim, or because it's starting a debugger in the background?

Here's my developer console with the weird "debugger attached" message.

Here's the CPU profile it spat out:

https://gist.github.com/taylorthurlow/06db37ce5a8dd9f79174ef68b0d46460

The only solution I have for this one is to reload the window.

[bung87]

the first error is catched , it will return a rejected promise. the second error I may do check file exists before parse db schema. for now initial your db schema first.

[bung87]

the main problem is vscode's activated extensions share limited resources , to properly report performance issue I think users need deactive others extensions .

[taylorthurlow]

the main problem is vscode's activated extensions share limited resources , to properly report performance issue I think users need deactive others extensions .

Gotcha. Sadly for me the problem doesn't happen often enough to be able to do that without wasting a bunch of time. Thanks for taking a look, though. Do you know why the extension host would log "Debugger attached"? I'm not in any sort of debugging session.