<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/63486>63486</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Clangd: PGO optimization results
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          zamazan4ik
      </td>
    </tr>
</table>

<pre>
    Hi!

Here I want to share my results with applying PGO on `clangd`. According to my local tests on AMD 5900x/48 Gib RAM/Fedora 38/Clang 16 (for building `clangd), `clangd` in Release mode without PGO finishes indexing `llvm-project` sources in ~10 minutes (9m55s), and `clangd` in Release mode with PGO (`fprofile-instr-generate`/`-fprofile-instr-use`) finishes indexing `llvm-projects` in ~8 minutes (7m50s - 7m55s). Tests were performed multiple times, with `clangd` cache reset between runs, on the latest `main` branch.

I think the results are quite good to add PGO support to `clangd` to the repository (as it's already done with `clang` itself). Another article about applying PGO on `clangd` you can find here: [JetBrains blog](https://blog.jetbrains.com/clion/2022/05/testing-3-approaches-performance-cpp_apps/)
</pre>
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