[turbopack] add task type infromation to the print_cache_item_size feature by lukesandberg · Pull Request #88925 · vercel/next.js

lukesandberg · 2026-01-23T02:23:55Z

Enhance our debugging output to include information about TaskType values

example output:

Task type cache stats: 337.82MiB (364.22MiB)
  49.98MiB (53.43MiB) <ModuleAssetContext as AssetContext>::resolve_asset  x 417238 avg 125B (134B)
  29.38MiB (31.46MiB) resolve  x 297288 avg 103B (110B)
  17.97MiB (22.58MiB) AssetIdent::new_inner  x 135310 avg 139B (174B)
  15.16MiB (21.86MiB) <ExternalCjsModulesResolvePlugin as AfterResolvePlugin>::after_resolve  x 90748 avg 175B (252B)
  12.36MiB (13.32MiB) resolve_internal  x 138970 avg 93B (100B)
  8.44MiB (7.86MiB) ResolveOrigin::resolve_options  x 301586 avg 29B (27B)
  8.43MiB (9.47MiB) AfterResolvePluginCondition::matches  x 87740 avg 100B (113B)
  6.70MiB (6.23MiB) <EsmAssetReference as ModuleReference>::resolve_reference  x 472105 avg 14B (13B)
  6.48MiB (7.81MiB) read_matches  x 81046 avg 83B (101B)
  6.40MiB (5.95MiB) <EsmAssetReference as ChunkableModuleReference>::chunking_type  x 451598 avg 14B (13B)
  6.39MiB (5.94MiB) <EsmAssetReference as ChunkableModuleReference>::binding_usage  x 450844 avg 14B (13B)
  6.03MiB (5.68MiB) <ModuleAssetContext as AssetContext>::process_resolve_result  x 184982 avg 34B (32B)
  5.99MiB (5.57MiB) EsmAssetReference::get_referenced_asset  x 422883 avg 14B (13B)

also add summary stats to the 'task cache stats'

Task cache stats: 3.23GiB (6.49GiB)
  302.72MiB (769.45MiB) <Code as GenerateSourceMap>::generate_source_map = 313.04KiB (308.92KiB) meta 8524 x 37B (37B), 302.42MiB (769.15MiB) data 8524 x 36.33KiB (92.40KiB)
  212.75MiB (592.88MiB) module_factory_with_code_generation_issue = 1.59MiB (1.51MiB) meta 45906 x 36B (34B), 211.16MiB (591.37MiB) data 45906 x 4.71KiB (13.19KiB)
  207.89MiB (526.37MiB) EcmascriptBuildNodeChunkContent::code = 1.08MiB (1.12MiB) meta 5163 x 219B (228B), 206.81MiB (525.24MiB) data 5163 x 41.02KiB (104.17KiB)
  205.21MiB (577.16MiB) EcmascriptChunkItemContent::new = 1.56MiB (1.63MiB) meta 24577 x 66B (69B), 203.65MiB (575.53MiB) data 24577 x 8.48KiB (23.98KiB)
  179.00MiB (441.68MiB) EcmascriptBrowserChunkContent::code = 905.40KiB (967.46KiB) meta 2485 x 373B (398B), 178.11MiB (440.74MiB) data 2485 x 73.40KiB (181.62KiB)

Using this information i can see that the largest task type is ~365b so we can safely decrease the size of our scratch buffer

lukesandberg · 2026-01-23T02:24:14Z

[turbopack] add task type infromation to the print_cache_item_size feature #88925 👈 (View in Graphite)
canary

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turbopack/crates/turbo-tasks-backend/src/kv_backing_storage.rs

codspeed-hq · 2026-01-23T02:45:05Z

Merging this PR will degrade performance by 6.98%

❌ 1 regressed benchmark
✅ 16 untouched benchmarks
⏩ 3 skipped benchmarks¹

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	`BASE`	`HEAD`	Efficiency
❌	Simulation	`jsonwebtoken.js[tracing]`	292.4 ms	314.4 ms	-6.98%

_{Comparing task_cache_key_stats (e50227b) with canary (2b3d4f8)}

3 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

nextjs-bot · 2026-01-23T02:47:31Z

Stats from current PR

✅ No significant changes detected

📊 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)	455ms	455ms	✓	▁▁▁█▁
Cold (Ready in log)	437ms	438ms	✓	▆▅▅█▅
Cold (First Request)	1.204s	1.155s	✓	███▇█
Warm (Listen)	457ms	456ms	✓	▁▁▁█▁
Warm (Ready in log)	443ms	443ms	✓	▁▁▁█▁
Warm (First Request)	335ms	338ms	✓	▁▁▁█▁

📦 Dev Server (Webpack) (Legacy)

📦 Dev Server (Webpack)

Metric	Canary	PR	Change	Trend
Cold (Listen)	455ms	456ms	✓	▅▁▅▅▅
Cold (Ready in log)	437ms	437ms	✓	▁▇▂▆█
Cold (First Request)	1.843s	1.839s	✓	▁▅▁▅█
Warm (Listen)	456ms	456ms	✓	▁▁▁▁▁
Warm (Ready in log)	437ms	439ms	✓	▂▅▁▅▇
Warm (First Request)	1.843s	1.846s	✓	▂▅▁▆▇

⚡ Production Builds

Metric	Canary	PR	Change	Trend
Fresh Build	4.334s	4.262s	✓	▂▁▁▇▁
Cached Build	4.344s	4.269s	✓	▁▁▁█▁

📦 Production Builds (Webpack) (Legacy)

📦 Production Builds (Webpack)

Metric	Canary	PR	Change	Trend
Fresh Build	13.943s	13.989s	✓	▂▁▁▁█
Cached Build	14.094s	14.098s	✓	▂▁▂▁▇
node_modules Size	460 MB	460 MB	✓	█████

📦 Bundle Sizes

Bundle Sizes

⚡ Turbopack

Client

Main Bundles: **432 kB** → **432 kB** ✅ -48 B

82 files with content-based hashes (individual files not comparable between builds)

Server

Middleware

	Canary	PR	Change
middleware-b..fest.js gzip	768 B	763 B	✓
Total	768 B	763 B	✅ -5 B

Build Details

Build Manifests

	Canary	PR	Change
_buildManifest.js gzip	452 B	450 B	✓
Total	452 B	450 B	✅ -2 B

📦 Webpack

Client

Main Bundles

	Canary	PR	Change
2086.HASH.js gzip	169 B	N/A	-
2161-HASH.js gzip	5.41 kB	N/A	-
2747-HASH.js gzip	4.48 kB	N/A	-
4322-HASH.js gzip	52.7 kB	N/A	-
ec793fe8-HASH.js gzip	62.3 kB	N/A	-
framework-HASH.js gzip	59.8 kB	59.8 kB	✓
main-app-HASH.js gzip	251 B	254 B	🔴 +3 B (+1%)
main-HASH.js gzip	38.7 kB	39.1 kB	✓
webpack-HASH.js gzip	1.68 kB	1.68 kB	✓
1596.HASH.js gzip	N/A	169 B	-
2658-HASH.js gzip	N/A	52.4 kB	-
6349-HASH.js gzip	N/A	4.46 kB	-
7019-HASH.js gzip	N/A	5.43 kB	-
b17a3386-HASH.js gzip	N/A	62.3 kB	-
Total	226 kB	226 kB	⚠️ +55 B

Polyfills

	Canary	PR	Change
polyfills-HASH.js gzip	39.4 kB	39.4 kB	✓
Total	39.4 kB	39.4 kB	✓

Pages

	Canary	PR	Change
_app-HASH.js gzip	194 B	193 B	✓
_error-HASH.js gzip	182 B	182 B	✓
css-HASH.js gzip	336 B	335 B	✓
dynamic-HASH.js gzip	1.8 kB	1.8 kB	✓
edge-ssr-HASH.js gzip	256 B	256 B	✓
head-HASH.js gzip	352 B	349 B	✓
hooks-HASH.js gzip	385 B	384 B	✓
image-HASH.js gzip	580 B	580 B	✓
index-HASH.js gzip	259 B	258 B	✓
link-HASH.js gzip	2.5 kB	2.51 kB	✓
routerDirect..HASH.js gzip	319 B	317 B	✓
script-HASH.js gzip	385 B	387 B	✓
withRouter-HASH.js gzip	316 B	315 B	✓
1afbb74e6ecf..834.css gzip	106 B	106 B	✓
Total	7.97 kB	7.96 kB	✅ -8 B

Server

Edge SSR

	Canary	PR	Change
edge-ssr.js gzip	126 kB	126 kB	✓
page.js gzip	244 kB	240 kB	🟢 4.71 kB (-2%)
Total	370 kB	366 kB	✅ -4.58 kB

Middleware

	Canary	PR	Change
middleware-b..fest.js gzip	617 B	619 B	✓
middleware-r..fest.js gzip	155 B	156 B	✓
middleware.js gzip	32.9 kB	33.3 kB	🔴 +384 B (+1%)
edge-runtime..pack.js gzip	842 B	842 B	✓
Total	34.5 kB	34.9 kB	⚠️ +387 B

Build Details

Build Manifests

	Canary	PR	Change
_buildManifest.js gzip	738 B	738 B	✓
Total	738 B	738 B	✓

Build Cache

	Canary	PR	Change
0.pack gzip	3.71 MB	3.71 MB	✓
index.pack gzip	102 kB	101 kB	✓
index.pack.old gzip	102 kB	102 kB	✓
Total	3.92 MB	3.92 MB	✅ -2.33 kB

🔄 Shared (bundler-independent)

Runtimes

	Canary	PR	Change
app-page-exp...dev.js gzip	306 kB	306 kB	✓
app-page-exp..prod.js gzip	163 kB	163 kB	✓
app-page-tur...dev.js gzip	306 kB	306 kB	✓
app-page-tur..prod.js gzip	163 kB	163 kB	✓
app-page-tur...dev.js gzip	302 kB	302 kB	✓
app-page-tur..prod.js gzip	161 kB	161 kB	✓
app-page.run...dev.js gzip	303 kB	303 kB	✓
app-page.run..prod.js gzip	161 kB	161 kB	✓
app-route-ex...dev.js gzip	69.4 kB	69.4 kB	✓
app-route-ex..prod.js gzip	48.2 kB	48.2 kB	✓
app-route-tu...dev.js gzip	69.4 kB	69.4 kB	✓
app-route-tu..prod.js gzip	48.2 kB	48.2 kB	✓
app-route-tu...dev.js gzip	69 kB	69 kB	✓
app-route-tu..prod.js gzip	47.9 kB	47.9 kB	✓
app-route.ru...dev.js gzip	68.9 kB	68.9 kB	✓
app-route.ru..prod.js gzip	47.9 kB	47.9 kB	✓
dist_client_...dev.js gzip	324 B	324 B	✓
dist_client_...dev.js gzip	326 B	326 B	✓
dist_client_...dev.js gzip	318 B	318 B	✓
dist_client_...dev.js gzip	317 B	317 B	✓
pages-api-tu...dev.js gzip	42.4 kB	42.4 kB	✓
pages-api-tu..prod.js gzip	32.2 kB	32.2 kB	✓
pages-api.ru...dev.js gzip	42.4 kB	42.4 kB	✓
pages-api.ru..prod.js gzip	32.2 kB	32.2 kB	✓
pages-turbo....dev.js gzip	51.7 kB	51.7 kB	✓
pages-turbo...prod.js gzip	38.8 kB	38.8 kB	✓
pages.runtim...dev.js gzip	51.7 kB	51.7 kB	✓
pages.runtim..prod.js gzip	38.8 kB	38.8 kB	✓
server.runti..prod.js gzip	62.3 kB	62.3 kB	✓
Total	2.73 MB	2.73 MB	✅ -5 B

turbopack/crates/turbo-tasks-backend/src/kv_backing_storage.rs

mmastrac

LGTM

lukesandberg · 2026-01-23T18:15:13Z

Merge activity

Jan 23, 6:15 PM UTC: @lukesandberg merged this pull request with Graphite.

nextjs-bot added created-by: Turbopack team PRs by the Turbopack team. Turbopack Related to Turbopack with Next.js. labels Jan 23, 2026

lukesandberg mentioned this pull request Jan 23, 2026

[Turbopack] Use a presized scratch buffer for task encoding #88924

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lukesandberg changed the title ~~add task type infromation to the print_cache_item_size feature~~ [turbopack] add task type infromation to the print_cache_item_size feature Jan 23, 2026

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lukesandberg force-pushed the cache_task_stats branch from 866e2c8 to ff6b6d5 Compare January 23, 2026 08:38

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lukesandberg changed the base branch from cache_task_stats to graphite-base/88925 January 23, 2026 16:21

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lukesandberg changed the base branch from graphite-base/88925 to canary January 23, 2026 16:21

add task type infromation to the print_cache_item_size feature

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[turbopack] add task type infromation to the print_cache_item_size feature#88925

[turbopack] add task type infromation to the print_cache_item_size feature#88925
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