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Turbopack: Use Arc<PathMap> and Box<Path> to make InvalidatorMap slightly more efficient#95987

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Turbopack: Use Arc<PathMap> and Box<Path> to make InvalidatorMap slightly more efficient#95987
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Addresses https://github.com/vercel/next.js/pull/95951/changes#r3617631291

  • We often already have an Arc<PathBuf> here.
  • The data stored in the queue is temporary, so the slight extra size of Arc<PathBuf> is fine, and saving the clone is nice.
  • The other references to the Arc<PathBuf> are not long-lived, so convert it into a Box<Path> once it goes into the locked map.

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Tests Passed

Commit: 808925c

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Stats from current PR

🔴 1 regression, 1 improvement

Metric Canary PR Change Trend
Webpack Cold (First Request) 3.602s 3.761s 🔴 +159ms (+4%) ▁█▁▁▁
Webpack Warm (First Request) 4.154s 3.553s 🟢 601ms (-14%) ▁█▁▁▁
📊 All Metrics
📖 Metrics Glossary

Dev Server Metrics:

  • Listen = TCP port starts accepting connections
  • First Request = HTTP server returns successful response
  • Cold = Fresh build (no cache)
  • Warm = With cached build artifacts

Build Metrics:

  • Fresh = Clean build (no .next directory)
  • Cached = With existing .next directory

Change Thresholds:

  • Time: Changes < 50ms AND < 10%, OR < 2% are insignificant
  • Size: Changes < 1KB AND < 1% are insignificant
  • All other changes are flagged to catch regressions

⚡ Dev Server

Metric Canary PR Change Trend
Cold (Listen) 811ms 811ms ✓ ▇▂▇▂▁
Cold (Ready in log) 767ms 772ms ✓ █▁█▁▁
Cold (First Request) 1.282s 1.270s ✓ █▁▇▁▁
Warm (Listen) 762ms 811ms ✓ ▇▁▇▁▁
Warm (Ready in log) 761ms 770ms ✓ ▇▁▇▁▁
Warm (First Request) 1.290s 1.285s ✓ ▇▁▇▂▁
📦 Dev Server (Webpack) (Legacy)

📦 Dev Server (Webpack)

Metric Canary PR Change Trend
Cold (Listen) 762ms 762ms ✓ ▂█▂▂▂
Cold (Ready in log) 762ms 761ms ✓ ▁█▁▁▁
Cold (First Request) 3.602s 3.761s 🔴 +159ms (+4%) ▁█▁▁▁
Warm (Listen) 761ms 760ms ✓ ▂█▂▂▁
Warm (Ready in log) 763ms 763ms ✓ ▁█▁▁▁
Warm (First Request) 4.154s 3.553s 🟢 601ms (-14%) ▁█▁▁▁

⚡ Production Builds

Metric Canary PR Change Trend
Fresh Build 4.951s 4.999s ✓ █▁▇▃▂
Cached Build 5.044s 5.031s ✓ ▇▁▇▃▁
📦 Production Builds (Webpack) (Legacy)

📦 Production Builds (Webpack)

Metric Canary PR Change Trend
Fresh Build 25.010s 24.969s ✓ ▁█▁▁▁
Cached Build 24.977s 24.944s ✓ ▁█▁▁▁
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📎 Tarball URL 
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Commit: 808925c

@bgw
bgw requested a review from lukesandberg July 20, 2026 23:44
@bgw
bgw marked this pull request as ready for review July 20, 2026 23:44
@bgw bgw mentioned this pull request Jul 21, 2026
Merged
@bgw
bgw force-pushed the bgw/add-minimum-release-age-to-tests branch from 36edbfe to 4b74428 Compare July 21, 2026 19:53
@bgw
bgw force-pushed the bgw/invalidator-map-arc branch from 37d6663 to 2dce3f2 Compare July 21, 2026 19:53
@bgw
bgw force-pushed the bgw/add-minimum-release-age-to-tests branch from 4b74428 to d7d72cb Compare July 21, 2026 20:21
@bgw
bgw force-pushed the bgw/invalidator-map-arc branch from 2dce3f2 to 81054a7 Compare July 21, 2026 20:21
Base automatically changed from bgw/add-minimum-release-age-to-tests to canary July 21, 2026 21:54
@bgw
bgw force-pushed the bgw/invalidator-map-arc branch from 81054a7 to 808925c Compare July 21, 2026 23:10
@bgw
bgw requested a review from a team July 21, 2026 23:56
@bgw
bgw merged commit 8882653 into canary Jul 22, 2026
228 of 230 checks passed
@bgw
bgw deleted the bgw/invalidator-map-arc branch July 22, 2026 23:38
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