From 422cff1f247dc334d5eb9387be924f5937b0c6d9 Mon Sep 17 00:00:00 2001
From: Nathan Whitaker <17734409+nathanwhit@users.noreply.github.com>
Date: Tue, 16 Apr 2024 12:26:51 -0700
Subject: chore(lsp): Add benchmark for performance on a large real-world repo
 (#23395)

This PR adds a benchmark intended to measure how the LSP handles larger
repos, as well as its performance on a more realistic workload.

The repo being benchmarked is
[deco-cx/apps](https://github.com/deco-cx/apps) which has been vendored
along with its dependencies. It's included as a git submodule as its
fairly large. The LSP requests used in the benchmark are the actual
requests sent by VSCode as I opened, modified, and navigated around a
file (to simulate an actual user interaction).

The main motivation is to have a more realistic benchmark that measures
how we do with a large number of files and dependencies. The
improvements made from 1.42 to 1.42.3 mostly improved performance with
larger repos, so none of our existing benchmarks showed an improvement.

Here are the results for the changes made from 1.42 to 1.42.3 (the new
benchmark is the last one listed):

**1.42.0**

```test
Starting Deno benchmark
-> Start benchmarking lsp
   - Simple Startup/Shutdown
      (10 runs, mean: 379ms)
   - Big Document/Several Edits
      (5 runs, mean: 1142ms)
   - Find/Replace
      (10 runs, mean: 51ms)
   - Code Lens
      (10 runs, mean: 443ms)
   - deco-cx/apps Multiple Edits + Navigation
      (5 runs, mean: 25121ms)
<- End benchmarking lsp
```

**1.42.3**

```text
Starting Deno benchmark
-> Start benchmarking lsp
   - Simple Startup/Shutdown
      (10 runs, mean: 383ms)
   - Big Document/Several Edits
      (5 runs, mean: 1135ms)
   - Find/Replace
      (10 runs, mean: 55ms)
   - Code Lens
      (10 runs, mean: 440ms)
   - deco-cx/apps Multiple Edits + Navigation
      (5 runs, mean: 11675ms)
<- End benchmarking lsp
```
---
 cli/bench/testdata/lsp_benchdata | 1 +
 1 file changed, 1 insertion(+)
 create mode 160000 cli/bench/testdata/lsp_benchdata

(limited to 'cli/bench/testdata/lsp_benchdata')

diff --git a/cli/bench/testdata/lsp_benchdata b/cli/bench/testdata/lsp_benchdata
new file mode 160000
index 000000000..af4c6a1ee
--- /dev/null
+++ b/cli/bench/testdata/lsp_benchdata
@@ -0,0 +1 @@
+Subproject commit af4c6a1eee825f19d3b3cce74cfdd03ebe1a3b92
-- 
cgit v1.2.3