microsoft / microsoft/vscode-cpptools

Find All References is really slow for this project

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#5,485 4 comments 5 reactions 0 assignees View on GitHub

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bug Feature: Find All References Language Service performance
Dominant language
TypeScript
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Forks
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Avg merge
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Merged PRs (30d)
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Description

See the repro details at https://github.com/microsoft/vscode-cpptools/issues/5376 . That issue got fixed, but the performance is unusually slow. I wasn't able to get Find All References to work in VS for comparison. There may be some performance bug. There might be a recursive includes and tag parser cause for the slowness in addition to IntelliSense parsing. The unification work may or may not improve this, but it would be a good test case to see if performance got better or worse after the unification work changes.

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start with the reproduction details in microsoft/vscode-cpptools#5376 and measure Find All References on this project. Investigate whether recursive includes, the tag parser, or IntelliSense parsing account for the slowness, and compare performance before and after the unification work; done means a confirmed cause or a measurable performance result.

Written by the indexing model from the issue text.

Assessment

Tech stack
cpp
Domain
performance, tooling
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
25/100

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